[hotfix] Harden YARNSessionCapacitySchedulerITCase#testTaskManagerFai…

…lure by removing timeout

We should wait until the runner has completed fully. Otherwise we might risk that the
Yarn application has not been fully shut down.

flink-yarn-tests/src/test/java/org/apache/flink/yarn/YARNSessionCapacitySchedulerITCase.java

@@ -331,7 +331,7 @@ public void testTaskManagerFailure() throws Exception {
  runner.sendStop();
  // wait for the thread to stop
  try {
- runner.join(1000);
+ runner.join();
  } catch (InterruptedException e) {
  LOG.warn("Interrupted while stopping runner", e);
  }