net: Make sure at least loopback works

Before this change even ping 127.0.0.1 was failing:

	root@deco:~# ping 127.0.0.1
	connect: Network is unreachable

slapns.py

@@ -225,6 +225,7 @@ def main():
     mount("none", slappart + "/sys", "sysfs")
 
     # TODO setup networking
+    os.system("/sbin/ifconfig lo 127.0.0.1")    # XXX at least loopback works
 
     # chroot to container
     slappart = abspath(slappart)