TLS is the fallback authorization driver, but it can only work when
dealing with a TLS connection, in all other cases, it's got to assume
that the user has full privileges.

There is no point in having it complain about it with every single API calls.

Closes lxc#2246

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

If getting a lot of events at once and dealing with slow handlers, we
may end up dropping events. To avoid the issue, we spawn the handlers in
the background so we can keep reading events as they come in.

Closes lxc#2404

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

This fixes an issue where routed NICs on VMs would fail to start unless
an MTU was specifically set by the user. That's because routed NICs
don't have a parent interface to inherit the MTU from.

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

Closes lxc#2424

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