Include support for SSH configuration files​

[Simcornelis]

Streamline the SSH connection using hosts defined in configuration files.​

[tbarbette]

This is an issue of paramiko, leading project like ansible to actually use SSH directly. The solution is to allow to use the enoslib engine instead of paramiko. Support is coming and will solve this.

[tbarbette]

The approach of #44 is therefore kinda doomed to be very limited.