PrometheusReporterEndToEndITCase.testReporter fail because Dispatcher REST endpoint did not start in time.

Apr 12 12:48:58 [ERROR] Tests run: 6, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 114.355 s <<< FAILURE! - in org.apache.flink.metrics.prometheus.tests.PrometheusReporterEndToEndITCase
Apr 12 12:48:58 [ERROR] testReporter[0: Jar in 'lib', instantiated via reflection](org.apache.flink.metrics.prometheus.tests.PrometheusReporterEndToEndITCase)  Time elapsed: 55.061 s  <<< FAILURE!
Apr 12 12:48:58 java.lang.AssertionError: Dispatcher REST endpoint did not start in time.
Apr 12 12:48:58 	at org.apache.flink.tests.util.flink.FlinkDistribution.startFlinkCluster(FlinkDistribution.java:148)
Apr 12 12:48:58 	at org.apache.flink.tests.util.flink.LocalStandaloneFlinkResource.startCluster(LocalStandaloneFlinkResource.java:133)
Apr 12 12:48:58 	at org.apache.flink.metrics.prometheus.tests.PrometheusReporterEndToEndITCase.testReporter(PrometheusReporterEndToEndITCase.java:231)
Apr 12 12:48:58 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Apr 12 12:48:58 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Apr 12 12:48:58 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Apr 12 12:48:58 	at java.lang.reflect.Method.invoke(Method.java:498)
Apr 12 12:48:58 	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
Apr 12 12:48:58 	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
Apr 12 12:48:58 	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
Apr 12 12:48:58 	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
Apr 12 12:48:58 	at org.apache.flink.util.ExternalResource$1.evaluate(ExternalResource.java:48)
Apr 12 12:48:58 	at org.apache.flink.util.ExternalResource$1.evaluate(ExternalResource.java:48)
Apr 12 12:48:58 	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
Apr 12 12:48:58 	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
Apr 12 12:48:58 	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
Apr 12 12:48:58 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
Apr 12 12:48:58 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
Apr 12 12:48:58 	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)