It will simplify later work if the sub-drivers have dedicated
APIs / field names. ie virNetworkDriver should have
virDrvNetworkOpen and virDrvNetworkClose methods
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Ensure that the driver struct field names match the public
API names. For an API virXXXX we must have a driver struct
field xXXXX. ie strip the leading 'vir' and lowercase any
leading uppercase letters.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Historically if traffic from the adapter is routed to LAN without
NAT, it isn't connected to any virtual networks, but has a 'type'
instead. Sinse libvirt has special virtual network type for such case,
let's add pseudo network 'routed' to fit libvirt's API well.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Fill bridge name and mac for bridged network and
DHCP server parameter for host-only network.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>

Parallels Cloud Server uses virtual networks model for network
configuration. It uses own tools for virtual network management.
So add network driver, which will be responsible for listing
virtual networks and performing different operations on them
(in consequent patched).

This patch only allows listing virtual network names, without
any parameters like DHCP server settings.
Signed-off-by: NDmitry Guryanov <dguryanov@parallels.com>