Improvements to LIFX reliability

[amelchio]

Description:

This PR fixes some rare issues with LIFX reliability:

• Unavailable lights would sometimes never return to available (fixed in aiolifx 0.6.3).
• A failed initialization would not unregister the light device, causing re-initialization to be delayed.
• The device.get_version call will not use the callback after its first successful call. Work around that by calling it last so it is not retried if device.get_color fails.

I also removed some excessive logging and rewrote a few lambda expressions to list comprehension.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox.

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.