lxc_spawn: initialize netpipe

When rebooting an unprivileged container, netpipe starts out
as not -1.  If count_veths somehow changed this could lead
to trying to send data over nonexistent pipe.  (Ok can't
*really* happen, as it currently stands, but it's an open
end)

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
lxc_start: return 1 not -1 on error

So that exit status doesn't show up as 255.

Reported-by: Andrey Khozov <avkhozov@googlemail.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
archlinux: add debugging info for missing network link

Signed-off-by: Ryan Mulligan <ryan@ryantm.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>