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: I218601a3720287071f05b9f2f624c1de4442d34f

openstack-common.conf

@@ -1,7 +1,18 @@
 [DEFAULT]
 
 # The list of modules to copy from openstack-common
-modules=gettextutils,importutils,install_venv_common,jsonutils,local,notifier,policy,setup,timeutils,log,version,uuidutils
+module=gettextutils
+module=importutils
+module=install_venv_common
+module=jsonutils
+module=local
+module=log
+module=notifier
+module=policy
+module=setup
+module=timeutils
+module=uuidutils
+module=version
 
 # The base module to hold the copy of openstack.common
 base=glance