ZOOKEEPER-3046: increased test timeout

- bump up timeout to avoid too many build failures

Author: Bogdan Kanivets <bkanivets@gmail.com>

Reviewers: phunt@apache.org

Closes #576 from lavacat/test-timeouts-3.5

Change-Id: If0b4b45c33e1909120ad15454f1c2f3f242237b6
(cherry picked from commit b78e83b1d7101b9fe76dd0b1ed8e7af37f8a587e)
Signed-off-by: Patrick Hunt <phunt@apache.org>

src/java/test/org/apache/zookeeper/test/DisconnectedWatcherTest.java

@@ -178,7 +178,7 @@ public class DisconnectedWatcherTest extends ClientBase {
 
     // @see jira issue ZOOKEEPER-706. Test auto reset of a large number of
     // watches which require multiple SetWatches calls.
-    @Test(timeout = 600000)
+    @Test(timeout = 840000)
     public void testManyChildWatchersAutoReset() throws Exception {
         ZooKeeper zk1 = createClient();