Add support for Rich Rules in firewalld module

firewalld Rich Language support
http://fedoraproject.org/wiki/Features/FirewalldRichLanguage

usage example:
```
- hosts: main
  gather_facts: false
  sudo: true

  tasks:
  - name: Add firewalld rich rule
    firewalld: rich_rule='rule service name="ftp" audit limit value="1/m" accept' permanent=true state=enabled
```