bridge: 'in_port' in flow_t is now an OpenFlow port number.

bridge: 'in_port' in flow_t is now an OpenFlow port number.

Commit b79520fe4 (Restore ovs-vswitchd VLAN, mirror, bonding, QoS features
("xflow" only)) broke the treatment of flows arriving on the local port.
This is because previously these flows had an in_port of XFLOWP_LOCAL,
but now they have an in_port of OFPP_LOCAL.  This commit fixes the problem.

I don't know how this snuck through my testing, since it's trivial to find.
I did do testing; perhaps I didn't do testing with a controller at the
right stage in development.