CBQE-0: fix for bixdcr.load_with_async_ops_and_joint_sets tests

Change-Id: I3a0fe5b06e808fb6e3d2234b29214adaf8f6b608
Reviewed-on: http://review.couchbase.org/30985
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>