* fix(opensuse): update to openSUSE Leap >= 15.4

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

* feat(opensuse): optional openSUSE devel repository

All modern openSUSE releases (Leap 15.x, Tumbleweed) ship nginx in the
default repositories. The devel repository should not be used unless the
user knows what they are doing.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

* fix(opensuse): pkgrepo.absent TypeError

Repository can only be removed by name, other fields cause del_repo() to
fail.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

---------

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

Entries are being duplicated as described in

* https://github.com/saltstack/salt/issues/60220 and
* https://github.com/saltstack/salt/issues/59785#issuecomment-826590482

* correctly set dependencies in configuration
* update RPM repo key
* add tests for passenger installation as nginx module
* update test matrix

* Close #261
* https://nginx.org/en/docs/ngx_core_module.html#worker_connections

```bash
Examining nginx/map.jinja of type state
[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:175
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:181
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:188
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:192
    })%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:195
    })%}
```

BREAKING CHANGE: all previous `nginx` based configurations must be reviewed;
`nginx.ng` usage must be promoted to `nginx` and any uses of the original
`nginx` will have to be converted.

like openSUSE and SLES