More pylint 2 fixes (#15516)

* Pylint 2 useless-import-alias fixes

* Pylint 2 chained-comparison fixes

* Pylint 2 consider-using-get fixes

* Pylint 2 len-as-condition fixes

homeassistant/helpers/service.py

@@ -123,7 +123,7 @@ async def async_get_all_descriptions(hass):
     def domain_yaml_file(domain):
         """Return the services.yaml location for a domain."""
         if domain == ha.DOMAIN:
-            import homeassistant.components as components
+            from homeassistant import components
             component_path = path.dirname(components.__file__)
         else:
             component_path = path.dirname(get_component(hass, domain).__file__)