datapath-windows: Output to multiple VXLAN ports

datapath-windows: Output to multiple VXLAN ports

If we have a flow rule of the following form:
 actions=strip_vlan,set_tunnel:0x3e9,15,16,17 (Where port 15, 16 and 17 are
 VXLAN OF ports with different tunnelling information)

Current implementation is that if a packet will hit that specific flow,
only one packet will be sent out with the first tunnelling information.

This patch saves the initial packet source port for further use of the
currently implemented pipeline and ignores the latter if it
is the last tunnelling port.

Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Acked-by: Sairam Venugopal <vsairam@vmware.com>
Acked-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>