firecracker: Network API update

The Network API no longer supports the state field. Using the
state field causes the API call to fail.

Note: The firecracker binary needs to be updated to match the API
as the older versions will expect the state field.

Fixes: #1078

Signed-off-by: Manohar Castelino <manohar.r.castelino@intel.com>

virtcontainers/fc.go

@@ -525,7 +525,6 @@ func (fc *firecracker) fcAddNetDevice(endpoint Endpoint) error {
 		GuestMac:          endpoint.HardwareAddr(),
 		IfaceID:           &ifaceID,
 		HostDevName:       endpoint.NetworkPair().TapInterface.TAPIface.Name,
-		State:             "Attached",
 	}
 	cfg.SetBody(ifaceCfg)
 	cfg.SetIfaceID(ifaceID)