CBQE-2286: basic stream tests for testrunner

examples here showing how to use the upr client for
stream mutations and also how to use a flow controlled stream.

Change-Id: I33502b1641881c3c509d93a79d03b40450da6d9a
Reviewed-on: http://review.couchbase.org/37863
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>