Use new pion/transport Net interface

This change adapts pion/ice to use a new interface for most network
related operations. The interface was formerly a simple struct vnet.Net
which was originally intended to facilicate testing. By replacing it
with an interface we have greater flexibility and allow users to hook
into the networking stack by providing their own implementation of
the interface.

examples/vnet/show-network-usage/main.go

@@ -12,7 +12,7 @@ import (
 	"time"
 
 	"github.com/pion/logging"
-	"github.com/pion/transport/vnet"
+	"github.com/pion/transport/v2/vnet"
 	"github.com/pion/webrtc/v3"
 )
 
@@ -83,9 +83,11 @@ func main() {
 	}()
 
 	// Create a network interface for offerer
-	offerVNet := vnet.NewNet(&vnet.NetConfig{
+	offerVNet, err := vnet.NewNet(&vnet.NetConfig{
 		StaticIPs: []string{"1.2.3.4"},
 	})
+	panicIfError(err)
+
 	// Add the network interface to the router
 	panicIfError(wan.AddNet(offerVNet))
 
@@ -94,9 +96,11 @@ func main() {
 	offerAPI := webrtc.NewAPI(webrtc.WithSettingEngine(offerSettingEngine))
 
 	// Create a network interface for answerer
-	answerVNet := vnet.NewNet(&vnet.NetConfig{
+	answerVNet, err := vnet.NewNet(&vnet.NetConfig{
 		StaticIPs: []string{"1.2.3.5"},
 	})
+	panicIfError(err)
+
 	// Add the network interface to the router
 	panicIfError(wan.AddNet(answerVNet))