Add ability to reboot a sandbox.

Fog requires sandboxes to be remotely rebooted, kicking off
the imaging process. agent.py and guest.py now have a reboot
method. guest.py also has a get_status method used by the Fog
machine manager.
Manage physical machines with Fog.

Unlike virtual machines which rely on snapshots, Fog requires
the sandbox to be reboot; it then boots a small image pulled
down over the network and images itself via a Fog task.
Add basic configuration file to be used with Fog.
Merge branch 'development' into fog_dev
Merge branch 'fog_dev' of https://github.com/MITRECND/cuckoo into MITRECND-fog_dev

Conflicts:
	agent/agent.py
	lib/cuckoo/core/guest.py
Added credentials to FOG conf
Removed reboot from guest.
Removed reboot from agent.
Changed reboot to RPC Shutdown; Added conf check for creds;
Merge pull request #122 from kholbrook1303/MITRECND-fog_dev

Mitrecnd fog dev
Merge branch 'MITRECND-fog_dev' into development
Merging MITRECND-fog_dev with development
Adding fog.py to machinery