Gateway ID field added to Openstack form.
Gateway ID field added to Openstack form.

This change adds the public gateway field to the
new Openstack Kube form.

jordanrinke/supergiant,jordanrinke/supergiant,jordanrinke/supergiant,supergiant/supergiant,jordanrinke/supergiant,supergiant/supergiant,supergiant/supergiant,supergiant/supergiant,jordanrinke/supergiant,supergiant/supergiant