Add support for DHT and DS18B20 sensors via Konnected firmware

[heythisisnate]

Description:

Adds support for digital sensors attached to a Konnected device. Currently the Konnected firmware supports DHT and DS18B20 sensors.

Pull request in home-assistant.io with documentation: home-assistant/home-assistant.io#8626

Example entry for configuration.yaml (if applicable):

konnected:
  access_token: CHANGEME
  devices:
    - id: dc4f223b1525
      sensors:
        - name: Outside
          type: dht
          pin: 6
        - name: Probe
          type: ds18b20
          pin: 7

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.

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:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

[heythisisnate]

@MartinHjelmare @pvizeli thank you for the great feedback. I learned a lot here. I've made the updates requested and it's a lot cleaner now. Would you mind taking another look?

[MartinHjelmare]

Very nice!

[MartinHjelmare]

Looks good!

[MartinHjelmare]

Can be merged when build passes.

[heythisisnate]

could anyone help out with a merge?