Improve systemd unit (#343)
Improve systemd unit (#343)

* Depend on LXD's socket unit instead of snapd

* Use systemd Wants= instead of Requires=

This allows using LXDUI inside a LXD container, passing the socket file
through from the host. Before, systemd would fail if LXD wasn't
installed because snap.lxd.daemon.unix.socket wouldn't be available to
start.

* Add systemd security directives
AdaptiveScale/lxdui,AdaptiveScale/lxdui,AdaptiveScale/lxdui,AdaptiveScale/lxdui