Convert all of pkg/* to linuxkit pkg build

This was done with the following "script":

    git rm pkg/{auditd,binfmt,init}/Makefile
    sed -e 's/IMAGE=/image: /g' -i pkg/*/Makefile
    sed -e 's/NETWORK=1/network: true/g' -i pkg/*/Makefile
    sed -e 's/ARCHES=x86_64/arches:\n  - amd64/g' -i pkg/*/Makefile
    sed -e '/DEPS:\?=/d' -i pkg/*/Makefile
    sed -e '/ARCHES=SKIP/d' -i pkg/node_exporter/Makefile
    sed -e 's/include \.\.\/package.mk//g' -i pkg/*/Makefile
    sed -e '/^$/d' -i pkg/*/Makefile
    git mv pkg/node_exporter/Makefile pkg/node_exporter/build.yml-skip
    for i in pkg/*/Makefile ; do git mv $i ${i%Makefile}build.yml ; done

and manual update of pkg/Makefile.

Signed-off-by: Ian Campbell <[email protected]>

pkg/init-lcow/build.yml

@@ -0,0 +1,4 @@
+image: init-lcow
+network: true
+arches:
+  - amd64