CBQE-2293: backport changes from pyupr

    MB-11367: test to add_stream and reopen consumer

    use cmd_quit to terminate connections quicker

Change-Id: I1f4abed00177a72c882c26b0a339511351abbca0
Reviewed-on: http://review.couchbase.org/38351
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: Tommie McAfee <tommie@couchbase.com>