Try to make the vib_modes test more robust in preparation for adding a new buildbot builder
Description
Try to make the vib_modes test more robust in preparation for adding a new buildbot builder.
News snippet
Try to make the vib_modes test more robust in preparation for adding a new buildbot builder.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.