CBQE-0: Remove redundant code from rebalance-xdcr

Change-Id: I7713d6a86fb00b008632c713bf210753dea339d2
Reviewed-on: http://review.couchbase.org/35191
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>