OVS split-horizon logic will drop pkts by default if value
of in_port and out_port is same. But, if we have two vlan-trunk member
VM for which trunk interface is same, the connectivity between these two
VM cannot be established as OVS drops such packets. So, it is required to
override the value of in_port so that split_horizon check is bypassed.
The in_port value need to be overrriden using load(ex: load:0->NXM_OF_IN_PORT[])

Related Bug in openflowplugin project: OPNFLWPLUG-763