feat: make http settings access_log_format and keepalive_timeout optional

[rolandjitsu]

Proposed changes

Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to that issue using one of the supported keywords here in this description (not in the title of the PR).

Make the following http_settings options:

1. access_log_format
2. keepalive_timeout

So that I can configure the main template like this (to enable the HTTP directive):

nginx_config_main_template_enable: true
nginx_config_main_template:
  http_enable: true
  http_settings:
    gzip:
      enable: true

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have added Molecule tests that prove my fix is effective or that my feature works
• I have checked that all Molecule tests pass after adding my changes
• I have updated any relevant documentation (defaults/main/*.yml, README.md and CHANGELOG.md)

NOTE: Let me know if I need to add some tests and where.

[alessfg]

I think it's safe to assume that is defined works as intended. I might circle back and add a proper check for each is defined in the role, but as of today I am more concerned with testing that any new template variables actually translate correctly to the templated config.

As an additional heads-up, as I continue refactoring individual NGINX modules to a more reusable and comprehensive macro pattern, both access_log_format and keepalive_timeout might undergo some changes before 0.4.0 proper is released.

[rolandjitsu]

I think it's safe to assume that is defined works as intended. I might circle back and add a proper check for each is defined in the role, but as of today I am more concerned with testing that any new template variables actually translate correctly to the templated config.

Thanks for merging! Sounds like a plan.

As an additional heads-up, as I continue refactoring individual NGINX modules to a more reusable and comprehensive macro pattern, both access_log_format and keepalive_timeout might undergo some changes before 0.4.0 proper is released.

Got it. I will keep an eye out for releases and breaking changes. Thanks.