More pylint 2 fixes (#15565)

## Description:

More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).

## Checklist:
  - [ ] The code change is tested and works locally.
  - [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**

homeassistant/components/rachio.py

@@ -130,7 +130,7 @@ def setup(hass, config) -> bool:
     return True
 
 
-class RachioPerson(object):
+class RachioPerson:
     """Represent a Rachio user."""
 
     def __init__(self, hass, rachio):
@@ -162,7 +162,7 @@ class RachioPerson(object):
         return self._controllers
 
 
-class RachioIro(object):
+class RachioIro:
     """Represent a Rachio Iro."""
 
     def __init__(self, hass, rachio, data):