Fix flaky TestReadOnly.testConnectionStateNewClient in ZooKeeper 3.9.3 - #1272

ZOOKEEPER-4508 reports `SessionExpired` after exhausting session timeout
in session establishment instead of endless retries. It is easy to get
in this now with small session timeout.

Besides above, `sessionTimeoutMs` should bigger than `connectionTimeoutMs`,
while default `Timing::session()` and `Timing::connection()` are `2s` and
`10s` respectively now.

```
// from CuratorZookeeperClient

if (sessionTimeoutMs < connectionTimeoutMs) {
    log.warn(
            "session timeout [{}] is less than connection timeout [{}]", sessionTimeoutMs, connectionTimeoutMs);
}
```