Enable stub_status and control status & API ports

[isaachawley]

In some IC deployments the hard-coded ports for the NGINX+ API conflict with other services already running on those containers, and the NGINX open source stub_status isn't exposed at all.

We'll add 2 CLI options:

• nginx-status-port the port to listen on
• nginx-status which enables/disables the api or stub_status. If disabled, we'll listen on a unix socket instead, so the IC can still use api features.

The stub_status location will be added in a separate server directive in the nginx config, similar to the existing NGINX Plus API location.

We'll need to extend the NGINX Plus go sdk to handle linux sockets.

[isaachawley]

This is done and merged:
#344

Is above changes are present in this docker image version nginx/nginx-ingress:1.3.0.
I am not able to use the above two options. if provided as arguments, ic is failing to start by printing the help.
but ideally it should export the metrics on port 8080. even that configurations is not present and not working.

[isaachawley]

Hi @vinodhbasavani please make an issue with your setup and steps to reproduce the issue.

But no, these changes are not in release 1.3.0.