Check Redis availability on slave

Running org.nuxeo.ecm.core.redis.TestRedisUIDSequencer
main 10:19:32,024 WARN  [CacheServiceImpl] Unregistery leaked contribution default-test-cache
StorageConfiguration: Deploying JDBC using DatabaseH2
StorageConfiguration: Deploying a VCS repository
Nuxeo-PubSub-Redis 10:19:32,878 ERROR [RedisPubSubProvider] Uncaught error on thread Nuxeo-PubSub-Redis
redis.clients.jedis.exceptions.JedisException: Could not return the resource to the pool
	at redis.clients.jedis.JedisPool.returnResource(JedisPool.java:114)
	at redis.clients.jedis.JedisPool.returnResource(JedisPool.java:12)
	at org.nuxeo.ecm.core.redis.RedisPoolExecutor.execute(RedisPoolExecutor.java:74)
	at org.nuxeo.ecm.core.redis.RedisFailoverExecutor$1.retry(RedisFailoverExecutor.java:62)
	at org.nuxeo.ecm.core.redis.retry.Retry.retry(Retry.java:61)
	at org.nuxeo.ecm.core.redis.RedisFailoverExecutor.executeWithRetryPolicy(RedisFailoverExecutor.java:57)
	at org.nuxeo.ecm.core.redis.RedisFailoverExecutor.execute(RedisFailoverExecutor.java:43)
	at org.nuxeo.ecm.core.redis.RedisExecutor.psubscribe(RedisExecutor.java:86)
	at org.nuxeo.ecm.core.redis.contribs.RedisPubSubProvider$Dispatcher.run(RedisPubSubProvider.java:142)
	at java.lang.Thread.run(Thread.java:745)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: Read timed out
	at redis.clients.util.RedisInputStream.ensureFill(RedisInputStream.java:201)
	at redis.clients.util.RedisInputStream.readByte(RedisInputStream.java:40)
	at redis.clients.jedis.Protocol.process(Protocol.java:132)
	at redis.clients.jedis.Protocol.read(Protocol.java:196)
	at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:288)
	at redis.clients.jedis.Connection.getAll(Connection.java:258)
	at redis.clients.jedis.Connection.getAll(Connection.java:250)
	at redis.clients.jedis.BinaryJedis.resetState(BinaryJedis.java:1653)
	at redis.clients.jedis.JedisPool.returnResource(JedisPool.java:110)
	... 9 more
Caused by: java.net.SocketTimeoutException: Read timed out
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:170)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at java.net.SocketInputStream.read(SocketInputStream.java:127)
	at redis.clients.util.RedisInputStream.ensureFill(RedisInputStream.java:195)
	... 17 more

testSendReceiveMultiInvalidations(org.nuxeo.ecm.core.redis.TestRedisClusterInvalidator)  Time elapsed: 0.055 sec  <<< FAILURE!
java.lang.AssertionError: expected:<2> but was:<1>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:555)
	at org.junit.Assert.assertEquals(Assert.java:542)
	at org.nuxeo.ecm.core.redis.TestRedisClusterInvalidator.testSendReceiveMultiInvalidations(TestRedisClusterInvalidator.java:118)