Revert "Upgrade ZooKeeper server to 3.5.8 "
Revert "Upgrade ZooKeeper server to 3.5.8 "

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