CBQE-0: added to tests for crash mater/cluster nodes during xdcr

Change-Id: I8fe5b30d3817837d0f4710a6d02c29d096de5741
Reviewed-on: http://review.couchbase.org/36778
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>