add epengine extended sanity conf

Change-Id: I72f3df7240e652d5c4778fd120bd456f14b6c793
Reviewed-on: http://review.couchbase.org/41576
Reviewed-by: Venu Uppalapati <venumahesh@gmail.com>
Tested-by: Venu Uppalapati <venumahesh@gmail.com>