Allow gunicorn log format to be customized

[balasankarc]

Is your feature request related to a problem? Please describe.

Currently, we either hardcode the gunicorn log format, or we let the defaults (which is the same we hardcode) get applied.

There is no way for Pulp administrators to configure this log format.

Describe the solution you'd like

We already expose gunicorn_workers and gunicorn_timeout as fields in the CRD. Also expose gunicorn_logformat as a field, and pass it as command line arguments while starting up the components.

[balasankarc]

@git-hyagi How do you feel about making the log format customizable for users who want to? This is kinda in relation with pulp/pulp-oci-images#775 where we want all the logs emitted by Pulp to be in JSON format, and right now gunicorn logs gets mixed between the JSON formatted ones.

[git-hyagi]

@balasankarc this is a good idea!!

[balasankarc]

@git-hyagi Awesome. We've opened #1567 towards that.