[v3.27] Fix broken pipe error when listing temp IP sets #9079
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Caused failures when we called list bu thten decided not to read the members list.
marvin-tigera
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fasaxc
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Description
Fix that resync of temporary IP sets would fail with a broken pipe error from ipset. This was because we failed to drain stdout in that case.
Fix that the mock dataplane didn't return an error in this case, resulting in the existing tests missing the problem. After fixing the tests, they fail as they always should have done then the fix makes them pass again.
Related issues/PRs
CI-1580
CORE-10564
Backport of #9077
Todos
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