Add VXLAN tunneling support for the ML2 plugin
Add VXLAN tunneling support for the ML2 plugin

Add an ML2 Type Driver for VXLAN networks to allow the creation
of VXLAN networks with the OVS agent.

Change-Id: I7fcc384cc44d5adc752510847d8ba5f46bbb79fb
Implements: blueprint ml2-vxlan

moshele/old-networking-mlnx