CBQE-0: refactor conf/py-newupgrade.conf

Change-Id: Id78d99a56cd3f88151a6a00894183625249c73dd
Reviewed-on: http://review.couchbase.org/25797
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>