adding ep-engine tests

Change-Id: If8d2d137cd86142ad56cc0051b6a8c804fa75cf4
Reviewed-on: http://review.couchbase.org/42217
Reviewed-by: Venu Uppalapati <venumahesh@gmail.com>
Tested-by: Venu Uppalapati <venumahesh@gmail.com>