CBQE-2365: fix log in RevId verification

Change-Id: Idd95212362e4d6ad46ed5371e792e63436ebefe9
Reviewed-on: http://review.couchbase.org/40331
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
CBQE-0: fix potential test code issue for merge_keys for bi-directional xdcr. Previously merge keys have None value in KvStore after merge and validation skipped.

Change-Id: I948128d622bf5bab3219d8071afbe0c42ec317ac
Reviewed-on: http://review.couchbase.org/40330
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
CBQE-2340: added support to ignore expected memcached errors during load data

Change-Id: I233b36c5e2f3ff6f2eb71f9f3c55d20b75a5d86b
Reviewed-on: http://review.couchbase.org/40303
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>