Enable lazy translation in unit tests

Change-Id: Ia2aaaaae34f0f234b2493e7c724d7b874035bcfb
Migrate to glanceclient to get image id

We should call the glanceclient to get_image_id instead novaclient.

Implements: blueprint migrate-to-glance-client
Change-Id: I2f5e4dfbe405b1ac74eb3864870b8e4873aeee9a
Merge "Enable lazy translation in unit tests"
Merge "Migrate to glanceclient to get image id"