First step to develop a new cleaner ssh_lxc interface.

Here we clone `ansible/plugins/connection/ssh.py` from Ansible version
2.9.6.

It will be adapted to use `lxc-attach` on the target host.

move debug messages from roles in task ca-dialog

this module read a file containing a public key and prepares
the sign_request for a ssl_host or ssh_host request

this role variables will be used during templating
for nginx reverse proxy

- 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

- handle errors when starting/stopping webserver
- fix typo

this module will help parsing the result of ssh certificates
and certification authorities to validate them