Adding a utility function for obtaining a network reference when given a eth device in Dom0
Modifying the parsing/retrieval of the network configuration to include all defined networks in the network conf file. This allows for the use of networks not currently undertest. All attempts to obtain static configuration now require a network reference and VLAN (default is 0) in order to make sure we pass back the correct object.
All instances of the 'get_static_manager' must now pass in a reference to the network they which to configure an interface on.