Switch to intermediate Mozilla cert profile

[balloob]

Description:

Allow users to downgrade the SSL profile to the Mozilla Intermediate SSL profile.

Modern profile was too modern for certain integrations that interact with the Home Assistant API. Sadly, because the error happens when setting up the connection, it's not easy to figure out the source integration.

Related issue (if applicable):
fixes #15538
fixes #15579

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#6013

Example entry for configuration.yaml (if applicable):

http:
  ssl_profile: intermediate

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If the code does not interact with devices:

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

[pvizeli]

LGTM

[Chimichanga-II]

You guys are great! Been looking at this with awe.
Sorry, i am a very unexperienced. First time Github.
Would be great if someone could help me just a little.

Is this solution ready to implement?
I understand that i need to allow choosing of the ssl profile.
But how can i change / add the files, mentioned in the 'files changed' (4) section?
Or is this still dev work, and can i better wait till the official HA Core review.