oslo.log: Configure log color by $LOG_COLOR

Relatively recently oslo.log 6.1.0 was released and contains change
I7966d4f4977b267f620946de4a5509f53b043652 which added an option to
enable color in logs which defaults to False. This caused a change in
behavior for DevStack such that viewing logs with journalctl no longer
showed different colors for different log levels, which can make
debugging more difficult when developing with DevStack.

This adds olso.log color configuration based on the existing $LOG_COLOR
DevStack variable for log color which defaults to True for interactive
invocations.

Change-Id: If10aada573eb4360e81585d4fb7e5d97f15bc52b

functions

@@ -694,6 +694,8 @@ function setup_colorized_logging {
     iniset $conf_file DEFAULT logging_default_format_string "%(asctime)s.%(msecs)03d %(color)s%(levelname)s %(name)s [-%(color)s] %(instance)s%(color)s%(message)s"
     iniset $conf_file DEFAULT logging_debug_format_suffix "from (pid=%(process)d) %(funcName)s %(pathname)s:%(lineno)d"
     iniset $conf_file DEFAULT logging_exception_prefix "%(color)s%(asctime)s.%(msecs)03d TRACE %(name)s %(instance)s"
+    # Enable or disable color for oslo.log
+    iniset $conf_file DEFAULT log_color $LOG_COLOR
 }
 
 function setup_systemd_logging {
@@ -715,6 +717,9 @@ function setup_systemd_logging {
     iniset $conf_file DEFAULT logging_context_format_string "%(color)s%(levelname)s %(name)s [%(global_request_id)s %(request_id)s %(project_name)s %(user_name)s%(color)s] %(instance)s%(color)s%(message)s"
     iniset $conf_file DEFAULT logging_default_format_string "%(color)s%(levelname)s %(name)s [-%(color)s] %(instance)s%(color)s%(message)s"
     iniset $conf_file DEFAULT logging_exception_prefix "ERROR %(name)s %(instance)s"
+
+    # Enable or disable color for oslo.log
+    iniset $conf_file DEFAULT log_color $LOG_COLOR
 }
 
 function setup_standard_logging_identity {