MB-100: fix replication_while_rebooting_a_non_master_destination_node

Change-Id: I53f648b04fadc5a9a5d6bf9d537028d5f02e447e
Reviewed-on: http://review.couchbase.org/24955
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>