Use kustomize to enable monitor (and proxy).

Created by: garloff

This is a different approach to fixing #173 (closed): We can explicitly ask the OCCM to use a health monitor, see discussion in #174. This is preferable, as we can leave the LB defaults as is.

Use kustomize to actually do the changes to the downloaded nginx deployment file, as this is a rather robust way.

Being at it, also allow enabling the proxy protocol, so out backends see the real IP (in the http header set by our nginx) and not just the VIP from the LB.

We save the generated nginx deployment file, so we can use it for cleanup in delete_cluster.sh again.

Also: Ship the nginx-i-c-v1.1.2 deployment file directly.

Signed-off-by: Kurt Garloff kurt@garloff.de