* Improve support for multiple Hue bridges with lights that have the same id.
The old code pre-refactoring kept a per-bridge list of lights in a closure; my refactoring moved that to hass.data, which is convenient but caused them to conflict with each other.
Fixes#11183
* Update test_hue.py
* Introduce a new Hue component that knows how to talk to a Hue bridge, but doesn't actually set up lights.
* Refactor the hue lights platform to use the HueBridge class from the hue component.
* Reimplement support for multiple bridges
* Auto discover bridges.
* Provide some migration support by showing a persistent notification.
* Address most feedback from code review.
* Call load_platform from inside HueBridge.setup passing the bridge id.
Not only this looks nicer, but it also nicely solves additional bridges being added after initial setup (e.g. pairing a second bridge should work now, I believe it required a restart before).
* Add a unit test for hue_activate_scene
* Address feedback from code review.
* After feedback from @andrey-git I was able to find a way to not import phue in tests, yay!
* Inject a mock phue in a couple of places
Andrea Campi