Add bridge module for the integration with Ansible

[isbm]

This adds a minimal integration with Ansible via cfg.bridge module. Key points:

• Ansible should be installed as a library on the client machine
• No support for action modules, only standalone (with main() function inside)
• It is slow as Python... 😉

Usage is pretty straightforward in actions:

actions:
  module: cfg.bridge
  state:
    my_state:
      opts:
        # Ansible module
        - copy
      args:
        src: /etc/networks
        dest: /tmp/networks.copy
        mode: 0400

This should basically call an Ansible module copy and copy /etc/networks as /tmp/networks.copy destination.