Add kerberos debug messages for Kafka secure tests

sbt.ForkMain$ForkError: org.apache.kafka.common.KafkaException: Failed to create new KafkaAdminClient
	at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:407)
	at org.apache.kafka.clients.admin.AdminClient.create(AdminClient.java:55)
	at org.apache.spark.sql.kafka010.KafkaTestUtils.setupEmbeddedKafkaServer(KafkaTestUtils.scala:227)
	at org.apache.spark.sql.kafka010.KafkaTestUtils.setup(KafkaTestUtils.scala:249)
	at org.apache.spark.sql.kafka010.KafkaDelegationTokenSuite.beforeAll(KafkaDelegationTokenSuite.scala:49)
	at org.scalatest.BeforeAndAfterAll.liftedTree1$1(BeforeAndAfterAll.scala:212)
	at org.scalatest.BeforeAndAfterAll.run(BeforeAndAfterAll.scala:210)
	at org.scalatest.BeforeAndAfterAll.run$(BeforeAndAfterAll.scala:208)
	at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:56)
	at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:317)
	at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:510)
	at sbt.ForkMain$Run$2.call(ForkMain.java:296)
	at sbt.ForkMain$Run$2.call(ForkMain.java:286)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: sbt.ForkMain$ForkError: org.apache.kafka.common.KafkaException: javax.security.auth.login.LoginException: Server not found in Kerberos database (7) - Server not found in Kerberos database
	at org.apache.kafka.common.network.SaslChannelBuilder.configure(SaslChannelBuilder.java:160)
	at org.apache.kafka.common.network.ChannelBuilders.create(ChannelBuilders.java:146)
	at org.apache.kafka.common.network.ChannelBuilders.clientChannelBuilder(ChannelBuilders.java:67)
	at org.apache.kafka.clients.ClientUtils.createChannelBuilder(ClientUtils.java:99)
	at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:382)
	... 16 more
Caused by: sbt.ForkMain$ForkError: javax.security.auth.login.LoginException: Server not found in Kerberos database (7) - Server not found in Kerberos database
	at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:804)
	at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:617)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755)
	at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)
	at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)
	at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
	at javax.security.auth.login.LoginContext.login(LoginContext.java:587)
	at org.apache.kafka.common.security.authenticator.AbstractLogin.login(AbstractLogin.java:60)
	at org.apache.kafka.common.security.kerberos.KerberosLogin.login(KerberosLogin.java:103)
	at org.apache.kafka.common.security.authenticator.LoginManager.<init>(LoginManager.java:61)
	at org.apache.kafka.common.security.authenticator.LoginManager.acquireLoginManager(LoginManager.java:104)
	at org.apache.kafka.common.network.SaslChannelBuilder.configure(SaslChannelBuilder.java:149)
	... 20 more
Caused by: sbt.ForkMain$ForkError: sun.security.krb5.KrbException: Server not found in Kerberos database (7) - Server not found in Kerberos database
	at sun.security.krb5.KrbAsRep.<init>(KrbAsRep.java:82)
	at sun.security.krb5.KrbAsReqBuilder.send(KrbAsReqBuilder.java:316)
	at sun.security.krb5.KrbAsReqBuilder.action(KrbAsReqBuilder.java:361)
	at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:776)
	... 37 more
Caused by: sbt.ForkMain$ForkError: sun.security.krb5.Asn1Exception: Identifier doesn't match expected value (906)
	at sun.security.krb5.internal.KDCRep.init(KDCRep.java:140)
	at sun.security.krb5.internal.ASRep.init(ASRep.java:64)
	at sun.security.krb5.internal.ASRep.<init>(ASRep.java:59)
	at sun.security.krb5.KrbAsRep.<init>(KrbAsRep.java:60)
	... 40 more