CBQE-0: refacor conf/py-autofailover.conf

Change-Id: I555935ba268d1dbfc3895d89007e124ab2a83851
Reviewed-on: http://review.couchbase.org/25796
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>