Pass in the 'br-ex' bridge instead of the integration bridge

Change-Id: I06650dd68bc80055646c3f0fc3b1bc7190f714a0
Look up the segmentation_id for provider networks

Change-Id: I8009a952b0457c149962e6643502f8a822318a72
Handle Provider Networks, by using mod_flow statements

Deleting the flow based on just the dl_vlan keyword would end up
deleting multiple flows, including the flow that would handle
rewriting the VLAN tag.

Change-Id: Ia010748c084be6b8480e8a3201aa74e96ea11358