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.

.gitignore

@@ -62,6 +62,7 @@ pip-log.txt
 .coverage
 .tox
 nosetests.xml
+htmlcov/
 
 # Translations
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