Revert and fix Unix socket location

[juanfont]

Reverts #1414

[ohdearaugustin]

This whole thing broke the installation for most people who use docker. Just changing the default unix_socket for packing with debian. We probably should fix the debian package and not just change the unix_socket location. This is a breaking change.

[juanfont]

This whole thing broke the installation for most people who use docker. Just changing the default unix_socket for packing with debian. We probably should fix the debian package and not just change the unix_socket location. This is a breaking change.

Any idea how to fix both things?

[ohdearaugustin]

I guess there are three options:

1. We change the the deb package build process, so it will also create the socket in /var/run/headscale.socket. I would still need to check if that is possible. This folder is created in the postinstall.sh of the package.

2. We add the /var/run/headscale/ folder directly in the docker container.

3. We only update the documentation for the install with docker that people need to change the unix_socket path in their setup to /var/run/headscale.socket

I personally prefer the first option as we would revert an unintentional breaking change of a default value. @kradalby Do you have any opinion on that? Or was this change necessary and I don't see why it was necessary?

[juanfont]

@ohdearaugustin we are going for option 2, as it seems the easiest and most compatible.