Add additional check of netperf output

[jtaleric]

Type of change

• [ ] Refactor
• [ ] New feature
• [x] Bug fix
• [ ] Optimization
• [ ] Documentation Update

Description

If the netperf output isn't a specific length, error out

Related Tickets & Documents

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Checklist before requesting a review

• [ ] I have performed a self-review of my code.
• [ ] If it is a core feature, I have added thorough tests.

Testing

• Please describe the System Under Test.
• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.