CBQE-0: import time in uniXDCR.py

Change-Id: I8d7d39e29930783d59322c9f3a0ae2056fa4186a
Reviewed-on: http://review.couchbase.org/30343
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>