avoid shadowing outer funcs in modules.lxc.list_()

```
************* Module salt.modules.lxc
salt/modules/lxc.py:294: [W0621(redefined-outer-name), list_] Redefining name 'info' from outer scope (line 468)
salt/modules/lxc.py:297: [W0621(redefined-outer-name), list_] Redefining name 'state' from outer scope (line 409)
```