Wrap net.Conn in DTLS listener

Wraps the net.Conn returned from the UDP listener in the DTLS listener.
The underlying UDP listener will be adapted in the future to support
returning net.PacketConn.

Signed-off-by: Daniel Mangum <georgedanielmangum@gmail.com>

listener.go

@@ -6,6 +6,7 @@ package dtls
 import (
 	"net"
 
+	"github.com/pion/dtls/v2/internal/util"
 	"github.com/pion/dtls/v2/pkg/protocol"
 	"github.com/pion/dtls/v2/pkg/protocol/recordlayer"
 	"github.com/pion/transport/v2/udp"
@@ -67,7 +68,7 @@ func (l *listener) Accept() (net.Conn, error) {
 	if err != nil {
 		return nil, err
 	}
-	return Server(c, l.config)
+	return Server(util.FromConn(c), c.RemoteAddr(), l.config)
 }
 
 // Close closes the listener.