Prefer 'command' over 'which' for RPM distro scripts

'which' is not available at _all_ by default on Centos7
or Centos8 Docker images out of the box.

'command' is, and serves the same purpose in this case.

Example:

    $ docker container run -it --rm centos:7
    [root@a7ba6b6aca53 /]# command -v which
    [root@a7ba6b6aca53 /]# command -v command
    command
    [root@a7ba6b6aca53 /]# exit
    exit

    $ docker container run -it --rm centos:8
    [root@eca6d461750b /]# command -v which
    [root@eca6d461750b /]# command -v command
    command
    [root@eca6d461750b /]# exit
    exit

rpm/setup

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_0.10

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_0.12

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_10.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_11.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_12.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_13.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_14.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_15.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_4.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_5.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_6.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_7.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_8.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_9.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_current.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_iojs_1.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_iojs_2.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_iojs_3.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/setup_lts.x

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"

rpm/src/_setup.sh

@@ -32,7 +32,7 @@ print_status() {
 }
 
 if test -t 1; then # if terminal
-    ncolors=$(which tput > /dev/null && tput colors) # supports color
+    ncolors=$(command -v tput > /dev/null && tput colors) # supports color
     if test -n "$ncolors" && test $ncolors -ge 8; then
         termcols=$(tput cols)
         bold="$(tput bold)"