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networkperf suite fails on amd64 due to the inclusion of the n4-standard-16 machine type #223

@kajiya3141

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@kajiya3141

This suite unfortunately fails altogether (i.e. no test results, just the daisy.log) due to the inclusion of n4-standard-16:

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"[networkperf.create-vms]: CreateInstances: Creating instance "servervmt2dstandard1-networkperf-1tmz4".
[networkperf]: Error running workflow: step "create-vms" run error: googleapi: Error 400: [pd-balanced, n4-standard-16] features are not compatible for creating instance., badRequest"

so I pushed a branch to my forked repo with n4-standard-16 dropped and it does actually run the tests then.

However, there were still a handful of failures across TestNetworkPerformance over the different machine types, but curiously the FAILURE messages were: Expected: 85 Gbits/s, Actual: 94.7 Gbits/s (as an example). Which doesn't seem like a true failure if it's exceeding the expected target? In the code the if statement is if resultPerf < expected so I wonder if the output is being mangled perhaps?

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