CBQE-0: add GROUP=GRACEFUL in py-couchbase-cli.conf

Change-Id: I18d0969ac83f57d25972e67d28f21d975d0e0a98
Reviewed-on: http://review.couchbase.org/37651
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>