Compatibility issues with lxd 4 and Fedora when setting up the ansible-based dev environment

[mbert]

On my Fedora system it took several steps to get the playbook xroad_init.yml running:

• The lxd installation used on my machine creates the Unix socket in a place where the lxd_container role searches for it.
• The host names in the lxd_hosts.txt inventory contain non-alphanumeric characters which is not accepted by lxd version 4.

As a remedy I needed to make the socket configurable and change the host names in the inventory.