Add zwave per-node entity. (#6690)

* Add zwave per-node entity.

* Disable lint import error

* Add tests for base class

* More tests

* More tests

* Sort .coveragerc

* more tests

* Move location, battery and wakeup to node entity

* More tests

* Cleanup

* Make zwave node entity visible by default

* Remove battery sensor

* Fix tests

homeassistant/components/zwave/util.py

@@ -69,3 +69,9 @@ def check_value_schema(value, schema):
                       value.instance, schema[const.DISC_INSTANCE])
         return False
     return True
+
+
+def node_name(node):
+    """Return the name of the node."""
+    return node.name or '{} {}'.format(
+        node.manufacturer_name, node.product_name)