Redis DelayerHRescheduleIntTests: unique groupId

https://build.spring.io/browse/INT-AT42SIO-595/

To avoid clashes with other parallel builds on CI for different versions
on the same shared Redis make a testing `groupId` as unique using
`UUID.randomUUID()`

**Cherry-pick to 4.3.x & 4.2.x**

Author: artembilan

spring-integration-redis/src/test/java/org/springframework/integration/redis/store/DelayerHandlerRescheduleIntegrationTests.java

@@ -19,6 +19,7 @@
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
 import org.junit.Rule;
@@ -46,7 +47,7 @@
  */
 public class DelayerHandlerRescheduleIntegrationTests extends RedisAvailableTests {
 
-	public static final String DELAYER_ID = "delayerWithRedisMS";
+	public static final String DELAYER_ID = "delayerWithRedisMS" + UUID.randomUUID();
 
 	@Rule
 	public LongRunningIntegrationTest longTests = new LongRunningIntegrationTest();