Drop log unsupported "spdy", make "http2" a server level option.

[oxpa]

Proposed changes

Removes long abandoned SPDY listening socket option.
Also moves http2 to a server level

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 any relevant Molecule tests pass after adding my changes
• I have updated any relevant documentation (defaults/main/*.yml, README.md and CHANGELOG.md)

[oxpa]

commit message is wrong >_<

[alessfg]

Thanks for the PR! I missed spdy no longer being supported.

Re implementing the new http2 directives -- the way the templates are organized, each "module" has its own template. Your current placement is within the core template, whereas the http2 directive should live inside its own module template. This helps in maintaining and tracking down any potential issues with the code further down the line.

I think the best location for the module would be before this macro block https://github.com/nginxinc/ansible-role-nginx-config/blob/main/templates/http/modules.j2#L23. You will then need to add the template to https://github.com/nginxinc/ansible-role-nginx-config/blob/main/templates/http/default.conf.j2. (There is no need to implement all the http2 directives right now, but creating its own template section will help with implementing the remaining directives further down the line 😄)

[oxpa]

OK, will do.
It's also better to postpone merging this PR till R30, when these changes are in N+

[alessfg]

Looks great! I added a few suggestions re the wording in comments (to keep all comments as standard as possible) and fix some Jinja2 quirks that might lead to unnecessary whitespaces.

One more thing, can you update the Changelog? Thanks!