Fixes test_config_drive unittest

Fixes test_detail_servers in the config drive unittest where the wrong db
stub was set which resulted in an empty server list being returned.
Fixes asserTrue typo which was never executed because of the empty server
list bug

Change-Id: I160e91c55e60e3636804b4d2b31800386a21538d
Merge "Fixes test_config_drive unittest"