** No longer affects: neutron

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https://bugs.launchpad.net/bugs/1435638

Title:
  ofagent: occasional test_server_connectivity_rebuild failure

Status in networking-ofagent:
  Fix Committed

Bug description:
  tempest test_server_connectivity_rebuild occasionally fail with
  ofagent.

  it turned out to be a problem in port monitoring.
  when a port is removed and then recreated with the same name in an agent's 
polling interval,
  it can miss the update and failed to update the corresponding flows.

  note1: flow updates are necessary because the switch is free to choose a 
different ofport number for the recreated port.
  note2: it isn't a problem for OVS-agent because it uses NORMAL action and 
doesn't have flows for a specific ofport.

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