Add flavor metatests

* Adds tests for the flavor model

Change-Id: I0424ee4d5ed86657294040d2fa66ee6aa940f821
Update Image v2 model unittests

Metatests were out of date for Image v2 model.

Change-Id: Ie6b72c27c42ebb7319b2b71a28caf579c74a38df
Merge "Add flavor metatests"
Merge "Update Image v2 model unittests"