CBQE-0 :: Clean failover conf and remove eviction policy option as it fails

Change-Id: I146a3805075e2dacdd823044226f7eb36353a566
Reviewed-on: http://review.couchbase.org/40314
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>