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/core.py

@@ -38,9 +38,9 @@ from homeassistant.exceptions import (
 from homeassistant.util.async_ import (
     run_coroutine_threadsafe, run_callback_threadsafe,
     fire_coroutine_threadsafe)
-import homeassistant.util as util
+from homeassistant import util
 import homeassistant.util.dt as dt_util
-import homeassistant.util.location as location
+from homeassistant.util import location
 from homeassistant.util.unit_system import UnitSystem, METRIC_SYSTEM  # NOQA
 
 # Typing imports that create a circular dependency