CBLT-179:  add random delay to prevent connection timeout to https://google.com

Change-Id: Ib97a51179b787485bdf9677f8b5478b17458a709
Reviewed-on: http://review.couchbase.org/35686
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>