Refactor compute and conductor tests to use objects

There are still a lot of tests that pass primitives to compute
and conductor methods that have expected objects for a long time
now. These also tend to do silly things like doing to_primitive()
on the db models, just to get the uuid out. Since this all makes
the following work harder, this patch converts them (all?) to use
objects.

Change-Id: I10a66fc02df92e91700544c0cb12517908f09710
Merge "Refactor compute and conductor tests to use objects"