Description:

This PR adds makes RainMachine compatible with the scan_machine configuration key.

Related issue (if applicable): N/A

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#5535

Example entry for configuration.yaml (if applicable):

rainmachine:
  ip_address: 192.168.2.16
  password: password_123

Checklist:

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

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.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.