Revert "Per request, locking ep-engine to revision from build 1075"

This reverts commit 703a9615c76b85cea930d0921dbb2347f3a2941a.

Change-Id: Id602743413d0964f332c89948c61e4158e9a9005
Reviewed-on: http://review.couchbase.org/40167
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>