Updated openstack/openstack
Project: openstack/nova  8d0b9ece8706cea313442b31fb031aef5106f3ff

Use common get_instance call in API plugins part 2

Cleanup API to use common get_instance call which
automatically does exception handling. These changes
are in a separate patch because they required some
unittest changes because of the manner in which some
methods were originally stubbed out.

Change-Id: Ide92ba84cc937191d25da0d643e8e4427a9aa8c7