Fix tests for filtering images by category

Change-Id: Id9253be71f95a9609944513cbfe38d81b9439b85
Nested dropdown for launch instance image selection

Change-Id: I78a222ec06fbd6c9dadc6537d587b87bfee65fe3
Allow snapshots of paused and suspended instances

Change-Id: Id483d13d8d329aee4a57d0a89e6368fab3b201ec
Closes-Bug: #1256821
(cherry picked from commit 860b2a0be11ceb2e57c4c0d0e7ff020325277c78)