[hotfix] Fix YARNSessionFIFOITCase

When comparing the hostname, it was comparing capitalised vs.
all-lowercase hostname from the yarn config.

flink-yarn-tests/src/main/java/org/apache/flink/yarn/YARNSessionFIFOITCase.java

@@ -71,7 +71,7 @@
 
 
 /**
- * This test starts a MiniYARNCluster with a FIFO scheudler.
+ * This test starts a MiniYARNCluster with a FIFO scheduler.
  * There are no queues for that scheduler.
  */
 public class YARNSessionFIFOITCase extends YarnTestBase {
@@ -206,12 +206,12 @@ public void testTaskManagerFailure() {
  String hostname = null;
  String port = null;
  while(matches.find()) {
- hostname = matches.group(1);
+ hostname = matches.group(1).toLowerCase();
  port = matches.group(2);
  }
  LOG.info("Extracted hostname:port: {} {}", hostname, port);
 
- Assert.assertEquals("unable to find hostname in " + parsed, hostname, parsed.getString(ConfigConstants.JOB_MANAGER_IPC_ADDRESS_KEY));
+ Assert.assertEquals("unable to find hostname in " + parsed, hostname, parsed.getString(ConfigConstants.JOB_MANAGER_IPC_ADDRESS_KEY).toLowerCase());
  Assert.assertEquals("unable to find port in " + parsed, port, parsed.getString(ConfigConstants.JOB_MANAGER_IPC_PORT_KEY));
 
  // test logfile access