CBD-1425:  use internal mirror for voltron git://10.1.1.210/voltron.git

Change-Id: Ic83761d762bddc6d9e74c24b04c509eb50e8739e
Reviewed-on: http://review.couchbase.org/40420
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>