CBQE-0: move set xdcr settings after init_clusters

Change-Id: Ic9011f7b1ad2109012068219827970ff0b9244ca
Reviewed-on: http://review.couchbase.org/37062
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>