Add Obihai integration

[dshokouhi]

Breaking Change:

Description:

Integration for Obihai devices to pull the line status.

Related issue (if applicable): fixes #n/a

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#10324

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: obihai
    host: 192.168.1.10
    username: admin
    password: 12345

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.

[MartinHjelmare]

Final comment.

[dshokouhi]

closing to reopen as CI errors are not related

[dshokouhi]

Looks like the error is unrelated

https://discordapp.com/channels/330944238910963714/330990195199442944/620994542044446742

[MartinHjelmare]

Great!

[MartinHjelmare]

Can be merged when build passes.