[PR #13621/836cfbac backport][8.4.x] selftests: Set a timeout for lsof #13623
      
        
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This is a backport of PR #13621 as merged into main (836cfba).
In case of hanging filesystems (e.g. unreachable sshfs),
lsofcan hang for a long time (3 minutes in my case). Set a more reasonable timeout and skip the affected test (like already done with other problems regarding lsof) in such a case.