CBQE:0 Fix not printing of missing keys + add pre-graceful failover active-replica key count

Change-Id: I3aba903d44a58d9f0cb33c6a49e6e8aae6cf5435
Reviewed-on: http://review.couchbase.org/43916
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>