uncheck "upload to couchbase" by default

Change-Id: I249c3745091db7c753f58890c4c59ccb2ab3c107
Reviewed-on: http://review.couchbase.org/37884
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Artem Stemkovski <artem@couchbase.com>