Updated openstack/openstack
Project: openstack/nova  cb51abc51e9eacc58a0767a9e42e11541a78ccc9

Use common get_instance call in API plugins

Cleanup API to use common get_instance call which
automatically does exception handling. Not all cases
are handled in this patch as some require more
significant testcase rework and are done in future
patches to make it easier to review.

Change-Id: Id27350e6562636f81347b490db649744b6b41186