Add global_request_id to systemd logs

With cinder supporting this now, start logging global_request_id in
systemd logs. It will be None for all the services until the work
starts coming together, but it is safe to do.

Change-Id: Ic6ba1a42da88c03e43d89658b453f6a0b353e0db
diff --git a/functions b/functions
index 52a82fa..ebc4c28 100644
--- a/functions
+++ b/functions
@@ -625,7 +625,7 @@
     fi
     iniset $conf_file $conf_section logging_debug_format_suffix "{{${pidstr}%(funcName)s %(pathname)s:%(lineno)d}}"
 
-    iniset $conf_file $conf_section logging_context_format_string "%(color)s%(levelname)s %(name)s [%(request_id)s %(project_name)s %(user_name)s%(color)s] %(instance)s%(color)s%(message)s"
+    iniset $conf_file $conf_section 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 $conf_section logging_default_format_string "%(color)s%(levelname)s %(name)s [-%(color)s] %(instance)s%(color)s%(message)s"
     iniset $conf_file $conf_section logging_exception_prefix "ERROR %(name)s %(instance)s"
 }