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Until now, the NXAST_RESUBMIT action has always looked up the original flow except for the updated in_port. This commit changes the semantics to instead look up the flow as modified by any preceding actions that affect it, e.g. if OFPAT_SET_VLAN_VID precedes NXAST_RESUBMIT, then NXAST_RESUBMIT now looks up the flow with the modified VLAN, not the original (as well as the modified in_port). Also, document how NXAST_RESUBMIT is supposed to work. Suggested-by: Paul Ingram <paul@nicira.com>