Macvendor (#4468)

* Add MAC vendor lookup for device_tracker.

* Test vendor mac lookup and fix device attribute.

* Generate requirements.

* Style.

* Use hyphen instead of underscore to satisfy 'idna'.

https://github.com/kjd/idna/issues/17

* Resort imports.

* Refactor macvendor to use macvendors.com API instead of netaddr library.

* Test vendor lookup using macvendors.com api.

* Remove debugging.

* Correct description.

* No longer needed.

* Device tracker is now an async component. Fix ddwrt tests.

* Fix linting.

* Add test case for error conditions.

* There is no reason to retry failes vendor loopups as they won't be saved to the file anyways at that point.

* Sorry, bad assumption, this only made things worse.

* Wait for async parts during setup component to complete before asserting results.

* Fix linting.

* Is generated when running 'coverage html'.

* Undo isort.

* Make aioclient_mock exception more generic.

* Only lookup mac vendor string with adding new device to known_devices.yaml.

* Undo isort.

* Revert unneeded change.

* Adjust to use new websession pattern.

* Always make sure to cleanup response.

* Use correct function to release response.

* Fix tests.

tests/test_util/aiohttp.py

@@ -22,7 +22,8 @@ class AiohttpClientMocker:
                 text=None,
                 content=None,
                 json=None,
-                params=None):
+                params=None,
+                exc=None):
         """Mock a request."""
         if json:
             text = _json.dumps(json)
@@ -33,6 +34,8 @@ class AiohttpClientMocker:
         if params:
             url = str(yarl.URL(url).with_query(params))
 
+        self.exc = exc
+
         self._mocks.append(AiohttpClientMockResponse(
             method, url, status, content))
 
@@ -68,6 +71,9 @@ class AiohttpClientMocker:
         for response in self._mocks:
             if response.match_request(method, url, params):
                 self.mock_calls.append((method, url))
+
+                if self.exc:
+                    raise self.exc
                 return response
 
         assert False, "No mock registered for {} {}".format(method.upper(),