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
Standardize on newer except syntax

We currently have a mix of 'except X, y:' and 'except X as y:' syntax.
Standardize on the newer 'except as' form.

This patch was generated automatically using:

find * -type f -name 'glance-*' ! -name '*\.conf' ! -name '*\.ini' -o \
 -name '*\.py' | xargs 2to3 -f except | patch -p0

Addresses bug 1160331.

Change-Id: Ica8d1303973af64d0406457267ee75f608e869d0
Merge "Reformat openstack-common.conf"
Merge "Standardize on newer except syntax"