Added features to Concord232 Alarm Panel

[AZDane]

Description:

Adds functionality to Concord232 Alarm Panel. 2 additional attributes can be defined in configuration.yaml. 'code' which allows for defining a code and 'mode' which allows for silent activation of the ARM HOME option

Currently Concord232 Server can Arm/Disarm without providing code or by providing wrong code. Updated code adds functionality to define a code in configuration.yaml.

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#9173

Example entry for configuration.yaml (if applicable):

alarm_control_panel:
  - platform: concord232
     host: 192.168.1.11
     code: 1234
     mode: silent

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

[AZDane]

I deleted 'or None' and committed the change