Make ManagerWithFind abstract and fix its descendants

ManagerWithFind requires list() method in its descendants.
Make it abstract and fix its improper descendants that do
not implement list() (SecurityGroupRuleManager and many others).

Fixes: bug #1180393
Change-Id: Ic8b466a57554018092c31c6d6b3ea62f181d7000
Migrate to pbr.

openstack.common.setup and openstack.common.version are now in the
standalone library pbr, so all projects using those two should
migrate.

Fixes bug 1179007.

Change-Id: I7ac1c37f0bf148619dffff8f454db05fc192e471
Merge "Make ManagerWithFind abstract and fix its descendants"