make test: Use VXLAN built in scapy 2.3.3

- fix documentation issues.
- fix mpls test.

Change-Id: Ieef6b4b5e4aca99e89bd03e45a991be89d42adba
Signed-off-by: Matej Klotton <mklotton@cisco.com>

test/scapy_handlers/vxlan.py

@@ -1,17 +0,0 @@
-from scapy.fields import BitField, XByteField, X3BytesField
-from scapy.packet import Packet, bind_layers
-from scapy.layers.l2 import Ether
-from scapy.layers.inet import UDP
-
-
-class VXLAN(Packet):
-    name = "VXLAN"
-    fields_desc = [BitField("flags", 0x08000000, 32),
-                   X3BytesField("vni", 0),
-                   XByteField("reserved", 0x00)]
-
-    def mysummary(self):
-        return self.sprintf("VXLAN (vni=%VXLAN.vni%)")
-
-bind_layers(UDP, VXLAN, dport=4789)
-bind_layers(VXLAN, Ether)