Add call direction sensor for Obihai

[dshokouhi]

Breaking Change:

Description:

Add a call direction sensor for Obihai. States are No Active Calls Inbound Call or Outbound Call

Related issue (if applicable): fixes #N/A
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: obihai
    host: 192.168.1.x

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]

Not sure why pylint is failing.

[dshokouhi]

@MartinHjelmare yea its failing for other PR's as well for the same or similar reason.

[dshokouhi]

@MartinHjelmare I have force pushed my branch after rebasing it and the pylint error is now resolved :)