lxc-start-ephemeral: Add missing return call to wait override

When overriding wait(), I forgot to actually return the value coming
from the C binding...

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

src/python-lxc/lxc/__init__.py

@@ -370,7 +370,7 @@ class Container(_lxc.Container):
         if isinstance(state, str):
             state = state.upper()
 
-        _lxc.Container.wait(self, state, timeout)
+        return _lxc.Container.wait(self, state, timeout)
 
 def list_containers(as_object=False):
     """