Replace stubout with fixtures
Replace stubout with fixtures

blueprint remove-mox

The last step in removing mox is to remove stubout usage. Lucky for us,
the fixtures library, which we are already using, can take on the
challenge quite well.

Change-Id: Id33cc8988935a1905f9a14351964f0bb24ef82e3

budnyjj/ofagent,yamt/networking-ofagent,budnyjj/ofagent,yamt/networking-ofagent-old3