MB-100 xdcr crash fix

crashes after deleting xmem replication
logs admin passwords

Change-Id: I34be6614726d1c6a655c8f11b2f0ebe1652d792a
Reviewed-on: http://review.couchbase.org/31472
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Junyi Xie <junyi.couchbase@gmail.com>