[Bug 1722799] Re: 2.8.0: test failure under s390x

[James Page]

Reading logs between a successful run on x86 and a failed run on s390x,
it would appear that stp never sees the topology change on br0 as p2 is
removed - this log message is missing from the s390x logs:

   br0: detected topology change.

so I suspect the fdb cache ends up hitting some sort of age timeout
before it gets flushed, rather than being activity flushed as a result
of the topology change.

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https://bugs.launchpad.net/bugs/1722799

Title:
  2.8.0: test failure under s390x

Status in openvswitch package in Ubuntu:
  Triaged

Bug description:
  ## ------------- ##
  ## Test results. ##
  ## ------------- ##

  ERROR: All 4 tests were run,
  1 failed unexpectedly.

  ## ------------------------ ##
  ## Summary of the failures. ##
  ## ------------------------ ##
  Failed tests:
  openvswitch 2.8.0 test suite test groups:

   NUM: FILE-NAME:LINE     TEST-GROUP-NAME
        KEYWORDS

   2222: stp.at:479         STP - flush the fdb and mdb when topology
  changed

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