👩‍🌾 ReplayStep test regression in Windows

[chapulina]

This test used to pass consistently, but started failing since 2020-10-23 for ign-transport8:

https://build.osrfoundation.org/job/ignition_transport-ci-ign-transport8-windows7-amd64/28/testReport/(root)/playback/ReplayStep/history/

It passes on ign-transport9 though:

https://build.osrfoundation.org/job/ignition_transport-ci-ign-transport9-windows7-amd64/1/testReport/(root)/playback/ReplayStep/history/

Failure log:

79: [ RUN      ] playback.ReplayStep
79: Chirping [100] times on [3] topics:
79:  -- /foo
79:  -- /bar
79:  -- /baz
79: Stepping playback...
79: D:\Jenkins\workspace\ignition_transport-ci-ign-transport8-windows7-amd64\ws\ign-transport\log\test\integration\playback.cc(660): error: Value of: MessagesAreEqual(secondMessageData, thirdMessageData)
79:   Actual: true
79: Expected: false
79: Waiting to for playback to finish...
79:  Done waiting...
79: Playback finished!
79: [  FAILED  ] playback.ReplayStep (4688 ms)