CBQE-0: fix imports in uniXDCR.py

Change-Id: I317750a97b4c2d7794e45b7bfc7cf10d850871d5
Reviewed-on: http://review.couchbase.org/30342
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>