Support GetNetOverflow in linux

[u5surf]

• use nstat -az
• fix Update GetNetOverflow function to use nstat instead of netstat #277 partially

Proposed changes

Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to that issue using one of the supported keywords here in this description (not in the title of the PR).

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[oliveromahony]

Thanks so much for your contribution @u5surf - Is it possible to run make deps as part of this PR and commit the changes?

Is it also possible to provide output for different operating systems based on this change?

Thanks

[u5surf]

@oliveromahony

Thanks so much for your contribution. Is it possible to run make deps as part of this PR and commit the changes?

Thanks reviewing. I could include the changes in commit now.

Is it also possible to provide output for different operating systems based on this change?

Sorry, I don’t have any time to prepare other runtime environment especially freebsd. It should be prepared as a virtual machine like VirtualBox. I will obtain enough time to see other os behavior because we will enter the holiday season in next Friday.

[oliveromahony]

@u5surf I can ask @craigell to take a look at the different environments. @craigell would you be able to do this?

[craigell]

@u5surf I can ask @craigell to take a look at the different environments. @craigell would you be able to do this?

I've taken a look and approved the request.