Correct socket use in cert_expiry platform

[elupus]

Description:

Make sure we use same family for ssl socket and connection

getaddrinfo result could be different from what connection
was made with. It also blocks potential use of
happy eye balls algorithm

This also fixes lingering sockets until python garbage
collection as well as add support to display availability of sensor.

This may fix related issues, but i've not really reproduced them.

Related issue (if applicable): #10550 #12607

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#<home-assistant.io PR number goes here>

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: cert_expiry
    host: google.com

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.