Fix wikibase tests

NEEDS: Ie0a7679a536ab085c37da8df969ec825ec590f6f
NEEDS: I752d94a932e6cd294e34c4e24bafdc5d59c93ac2

For each patchset tests we will:
 Load client only and run all tests
 Load repo only and run all tests
  -  Split into API and non API jobs

For each gate-submit tests we will:
 Load both client and repo and run all tests
 Load client only and run all tests
 Load repo only and run all tests
  -  Split into API and non API jobs

This should be new patchsets test run time is
 generally half of what it currently is

This also means that our gate-submit jobs actually
 check everything rather than just repo tests...

Change-Id: I9ecdb9a746516ba30214748cf169f100651bad51