Deprecates linksys_ap integration (ADR-0004)

[frenck]

Breaking Change:

The Linksys Access Points integration has been deprecated and is pending for removal in Home Assistant 0.100.0.

Description:

This PR deprecates the Linksys Access Points integration since it relies on web scraping to function.
As per ADR-0004 this is no longer allowed. The integration should now be deprecated for 2 releases before permanent removal.

Evidence: https://github.com/home-assistant/home-assistant/blob/4de97ab/homeassistant/components/linksys_ap/device_tracker.py#L82

Related issue (if applicable): n/a

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#10092

Example entry for configuration.yaml (if applicable): n/a

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

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

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.