YARN-7048. Fix tests faking kerberos to explicitly set ugi auth type. Contributed by Daryn Sharp

(cherry picked from commit 657dd59cc840bce3426170baf68f9d46842f4f53)

Conflicts:
	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/security/TestRMDelegationTokens.java

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestTokenClientRMService.java

@@ -28,6 +28,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.SaslRpcServer.AuthMethod;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
 import org.apache.hadoop.security.authentication.util.KerberosName;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.yarn.api.protocolrecords.CancelDelegationTokenRequest;
@@ -80,6 +81,8 @@ public class TestTokenClientRMService {
     conf.set("hadoop.security.authentication", "kerberos");
     conf.set("hadoop.security.auth_to_local", kerberosRule);
     UserGroupInformation.setConfiguration(conf);
+    UserGroupInformation.getLoginUser()
+       .setAuthenticationMethod(AuthenticationMethod.KERBEROS);
   }
 
   @AfterClass

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/security/TestRMDelegationTokens.java

@@ -29,6 +29,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.security.token.delegation.DelegationKey;
 import org.apache.hadoop.util.ExitUtil;
@@ -73,6 +74,9 @@ public class TestRMDelegationTokens {
     Configuration conf = new Configuration(testConf);
     conf.set("hadoop.security.authentication", "kerberos");
     UserGroupInformation.setConfiguration(conf);
+    UserGroupInformation.getLoginUser()
+        .setAuthenticationMethod(AuthenticationMethod.KERBEROS);
+
     MemoryRMStateStore memStore = new MemoryRMStateStore();
     memStore.init(conf);
     RMState rmState = memStore.getState();