CBQE-0: ConversionUseTransfer with latest_version=None by default

now tests are run with old hardcoded build

Change-Id: Ic29f2c27d7518b16d6c3e2e185ccb3fe116af39b
Reviewed-on: http://review.couchbase.org/40678
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>