Run waitpid on childs to ensure no zombies are left behind

[saschagrunert]

What type of PR is this?

/kind bug

What this PR does / why we need it:

We can call waitpid on the process to reparent and ensure no zombies are left behind.

Which issue(s) this PR fixes:

Fixes containers/crun#1482
Fixes #2242

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

Fixed issue that containers cannot be removed if init command was not found.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.26%. Comparing base (4e0f474) to head (9e944a7).
Report is 724 commits behind head on main.

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Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2415       +/-   ##
===========================================
+ Coverage   37.53%   63.26%   +25.72%     
===========================================
  Files          15      121      +106     
  Lines        1268     4007     +2739     
  Branches      414      830      +416     
===========================================
+ Hits          476     2535     +2059     
- Misses        526     1472      +946     
+ Partials      266        0      -266     

[saschagrunert]

Rebased

[kwilczynski]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kwilczynski, saschagrunert

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