Does not compile with Python3

[AmedeoSapio]

In setup.py line 35
os.chmod(fname,0755)
does not work with Python3, because leading zeros are not allowed on numbers.
The original scapy repo changed it to:
os.chmod(fname,0o755)

[johnthagen]

Upstream scapy supports Python 3 now. It also appears to support VXLAN: https://github.com/secdev/scapy/blob/master/scapy/layers/vxlan.py