Why I did it
The current PTF library contains a typo - when building a VxLAN packet, it uses the VxLAN module directly from the scapy library which will cause test failures.
How I did it
Patch simple_vxlan_packet to use the VxLAN module wrapped/defined in packet.py from the PTF library.
Signed-off-by: Lawrence Lee <lawlee@microsoft.com>
