Fix up a little test failure.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1494790 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java

@@ -729,6 +729,9 @@ public class TestSaslRPC {
     final Configuration clientConf = new Configuration(conf);
     SecurityUtil.setAuthenticationMethod(clientAuth, clientConf);
     UserGroupInformation.setConfiguration(clientConf);
+    clientConf.setBoolean(
+        CommonConfigurationKeys.IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_KEY,
+        true);
     
     final UserGroupInformation clientUgi =
         UserGroupInformation.createRemoteUser(currentUser + "-CLIENT");