Add role prefix to role specifig variable to avoid conflicts when
using multiples role on the same machine on the same play.

(IcingaWeb2) Configuration issues fixed:

- Missing `php-fpm` requirement.

- Migrating php7.0 -> php 7.3 in nginx config location config file.

- Fixed `rewrite` rule in nginx configuration:
    When usign `/icingaweb2` as rewrite target nginx automatically
    expand the redirect 302 response as
    `$scheme://$remote_host:$remote_port/icingaweb2`, causing
    connection to fail when behind a *reverse proxy*, because
    remote_post and remote_host are incorrect.

- Remove hardcoded `status.lilik.it` in `meta/main.yaml`,
  `server_fqdn` is already defined in `defaults/main.yaml` as
  `{{ ansible_hostname }}.{{ domain }}`.

- remove the handling of which template to use
- do not access parent role
- update riot-web nginx configuration
- update icinga role to use new nginx templating
- update synapse nginx configuration
- update matrix role to use new nginx templates
- update dokuwiki to use new nginx template
- extend nginx template in dokuwiki
- update login role to new nginx templates
- add protocol for default option
- add extra block to nginx template
- update riote-web version
- fix template extension for riot web nginx definition
- update login template for nginx endpoint