conf.c: fix unprivileged network case

If unprivileged users are using a veth nic, then ifindex is still 0
at lxc_assign_network() (because lxc_create_network() was skipped).
So check for that case before we use lxc->ifindex to decide if we
have an empty network namespace.

We probably should change the !netdev->ifindex check to a
netdev->type == LXC_NET_EMPTY check, but I've been making enough
mistakes today not to risk that.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Set default paths for unprivileged use

When running unprivileged (euid != 0), LXC will now use the following paths:
 - Default lxc path: ~/.local/share/lxc/
 - Default config path: ~/.config/lxc/lxc.conf

Those two paths are based on standard XDG paths (though ignoring all the
possible override paths for now at least) and so probably don't need to
be configurable at build time.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>