https://build.spring.io/browse/INT-AT42SIO-253/
```
java.lang.AssertionError: Should have been able to lock with zookeeper server restarted!
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.springframework.integration.zookeeper.lock.ZkLockRegistryTests.voidLockFailsWhenServerDown(ZkLockRegistryTests.java:339)
```
When we do `testingServer.restart();` we should give more time to let it started on background, therefore increase the next `lock2.tryLock()` to 10 seconds.
**Cherry-pick to 4.3.x and 4.2.x**
6ffdd5eee3