CBQE-1369: clean up old upgrade testrunner code

Change-Id: I4b8165bf007a476b1ec19ec935869024e2f9de04
Reviewed-on: http://review.couchbase.org/27078
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>