CBQE-0: fix bixdcr.replication_while_rebooting_a_non_master_destination_node test

Change-Id: I20f57b09a6fcb16b6cc2839428c7e367619d36c5
Reviewed-on: http://review.couchbase.org/30984
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>