update k8s-topgun configure for external postgresql by v11 chart
update k8s-topgun configure for external postgresql by v11 chart

Signed-off-by: Rui Yang <4d6b7b1f23ec6027b801cceb8a18a6505e32557e@vmware.com>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse