Fixes#1353.
## Summary
This allows you to use a docked ethernet adapter as the thing to decide whether you are currently internal. This will help hardware without Wi-Fi or with Wi-Fi disabled to use the feature.
## Screenshots
<img width="400" alt="Screen Shot 2021-01-12 at 20 26 28" src="https://user-images.githubusercontent.com/74188/104407176-df106580-5515-11eb-82a0-2b5d4eb23694.png"><img width="400" alt="Screen Shot 2021-01-12 at 20 26 23" src="https://user-images.githubusercontent.com/74188/104407181-e0da2900-5515-11eb-9c2c-773c725cb841.png">
## Link to pull request in Documentation repository
<!-- Pull requests that add, change or remove functionality must have a corresponding pull request in the Companion App Documentation repository (https://github.com/home-assistant/companion.home-assistant). Please add the number of this pull request after the "#" -->
Documentation: home-assistant/companion.home-assistant#
## Any other notes
- Removes some "is this internal?" dead code during onboarding. Probably worth doing the internal/external pull in at this point.
- Pulls some of the class method things on ConnectionInfo into the connectivity wrapper in Environment.
Fixes#1184.
## Summary
This is the same sensor as we send up on iOS except it now bounces between No Connection, Wi-Fi and Ethernet.
## Link to pull request in Documentation repository
Documentation: home-assistant/companion.home-assistant#424
## Any other notes
- `sensor.connection_type` now has an `Ethernet` value and is set up on macOS.
- `sensor.connection_type` gains attributes on macOS: `Name` (the name of the network interface, e.g. `Wi-Fi`) and `Hardware Address` (the MAC address of the interface).
- Adds signaled updates to this (and other network) sensors.
Important to note that, although Ethernet is now added to Connection Type, the Wi-Fi sensors for SSID and BSSID will still report values if any Wi-Fi network device is connected, even if it is not the primary route.
