Configurable Data Plane Log-Level

[mpstefan]

As a user of NKG
I want the ability to assign a log level for the data plane
So that I can enable more verbose log output when I want more information around how NGINX is performing.

Acceptance

• Users can set the log level for the data plane based on a value within the NginxProxy resource.
• The Data Plane configuration document is updated to include:
  • How the user can change the log level with links to the log levels available
  • How to build with the debugging option on NGINX as described in error_log.

[mpstefan]

We decided to wait on this until the enhancement proposal for data plane configuration has been merged.