get rid of '${lxcpath}_anon' idea

The idea was simply misguided.

If you provide a custom configuration file, you still should be
putting the command sock into the real lxcpath, not an 'anon' one.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>