pidof: Implement --with-workers

[dezgeg]

Lots of tests rely on finding kthreadd thus -w flag needs to be added to them.

[Krysztal112233]

Hmm, which version of procps-ng are you using?

➜  procps git:(pidof-w) cargo run -q pidof kthreadd
➜  procps git:(pidof-w) pidof kthreadd
2
➜  procps git:(pidof-w) pidof -h
pidof usage: [options] <program-name>

 -c           Return PIDs with the same root directory
 -d <sep>     Use the provided character as output separator
 -h           Display this help text
 -n           Avoid using stat system function on network shares
 -o <pid>     Omit results with a given PID
 -q           Quiet mode. Do not display output
 -s           Only return one PID
 -x           Return PIDs of shells running scripts with a matching name
 -z           List zombie and I/O waiting processes. May cause pidof to hang.

[dezgeg]

From Arch Linux: pidof from procps-ng 4.0.5-dirty

Your version of pidof doesn't look like it's from procps-ng but sysvinit-utils (assuming Ubuntu)

[Krysztal112233]

Yes. Great work, thanks for your contributing :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (eb0871a) to head (9fb6aa3).
Report is 9 commits behind head on main.

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