Revert "Fix Slobrok race between completion callback and scheduled task [run-systemtest]"
Revert "Fix Slobrok race between completion callback and scheduled task [run-systemtest]"

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa