Add device automation action

[emontnemery]

Description:

Add websock command to query device for actions.

Conditions can be provided by the integration that provided the device or the entity integrations that the device has entities with.

As an example of the latter, this PR also adds turn_on and turn_off conditions to light entities.

This PR is intended as a step towards home-assistant/architecture#178

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):

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 does not interact with devices:

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