CBQE-1107: improvements in GetrTests

only one parameterized test method

Change-Id: I6d4bd4ada404cf6cdda87657841e820808437402
Reviewed-on: http://review.couchbase.org/25211
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>