[pfsense_user] Add support for disabling users

[JonatanLindstrom]

Adds the possibility to control if a user should be disabled or not. Useful for temporary changes or when you want to preserve the history of a user.

Example usage:

- name: Add operator user
  pfsense_user:
    name: operator
    descr: Operator

- name: Disable user
  pfsense_user:
    name: operator
    disabled: true

[JonatanLindstrom]

@opoplawski any chance we could see this get merged and released soon-ish?

[opoplawski]

Done, thanks! I'd like to cleanup a couple other things but hope to get a new release out soon.

[opoplawski]

Oh - and just for future reference - please make a new branch when doing pull requests. It does make things easier.