CBLT-283:  increase refresh time from 120 to 720 seconds

Change-Id: Ia9001dd12d2c129f0fe4b8f4407f63e6888b2325
Reviewed-on: http://review.couchbase.org/36878
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>