Reformat openstack-common.conf

Use the new 'module' option in openstack-common.conf which is a
multi-string option, allowing each module name to be placed on a
separate line.

This makes it much easier to review changes to the modules list.

Change-Id: I3085f841c1d0a934502b3563a9ad01f885b3fe08

openstack-common.conf

@@ -1,3 +1,20 @@
 [DEFAULT]
-modules=rpc,importutils,excutils,local,jsonutils,gettextutils,timeutils,notifier,context,log,network_utils,setup,policy,service,threadgroup,eventlet_backdoor,loopingcall,version
+module=context
+module=eventlet_backdoor
+module=excutils
+module=gettextutils
+module=importutils
+module=jsonutils
+module=local
+module=log
+module=loopingcall
+module=network_utils
+module=notifier
+module=policy
+module=rpc
+module=service
+module=setup
+module=threadgroup
+module=timeutils
+module=version
 base=ceilometer