Add Yeelight Ceiling Light support

[pauln]

Adds discovery of Yeelight Ceiling Light (Wifi + Bluetooth).

[rytilahti]

Have you tested this on your own system? There used to be a check for it (albeit with a bit different name), which got reverted in #152.

[pauln]

@rytilahti Although (in line with the comments on #151) my ceiling lamp never used to announce itself over mDNS, it seems to have recently begun doing so (I'm currently on firmware v1.5.5_0178, which also added support for the ceiling lamp acting as a wifi gateway for BLE devices). As such, I'm now getting periodic log messages in Home Assistant about it:
Unknown miio device found: ServiceInfo(type='_miio._udp.local.', name='yeelink-light-ceiling1_mibtXXXXXXXX._miio._udp.local.' [clipped for brevity]

Although I hadn't earlier, I've just tested this change and can confirm that it works (for me) - Home Assistant discovers the lamp and can control it with no manual configuration, whereas I've previously had to add it to configuration.yaml to get Home Assistant to see it. (It still works with the manual config too, so it's a non-breaking change as far as I can tell.)

[rytilahti]

Ok, let's merge this then (the linter errors are not caused by this PR), great to see they have fixed the discovery :-)

[Notrial]

Hi guys,
I've updated to 0.63 and this problem seems to remain. I'm new to HA, so I'm unfamiliar with component updates and whether the fixes are applied automatically with the next HA build? Do I have to do something manually in order to fix this?

[MartinHjelmare]

Please open an issue if you suspect a bug. If you need help please use our help channels:
https://home-assistant.io/help/#communication-channels

Merged PRs should not be used for support or bug reports. Thanks!