[KYUUBI #1291] [TEST] Transfer KRB5_CONF to kinit and fix kerberos UT…

… on macOS

### _Why are the changes needed?_
1. transfer KRB5_CONF of KyuubiServer to kinit process in case the system KRB5_CONF is not same with `java.security.krb5.conf` of KyuubiServer JVM.
2. The UT with kerberos enabled KyuubiServer can not pass on osx environment, such as `KyuubiOperationKerberosAndPlainAuthSuite` (#1266). For the root cause, see details in https://stackoverflow.com/questions/27053539/openldap-kerberos-unable-to-reach-any-kdc-in-realm

### _How was this patch tested?_
`KyuubiOperationKerberosAndPlainAuthSuite` can pass on my MacBook, without this PR, it will fail on MacBook.

Closes #1291 from turboFei/kinit_ut.

Closes #1291

f006054 [fwang12] complete KRB5_CONFIG
859538c [fwang12] Make kerberos enabled kyuubi server unit test runnable for osx environment

Authored-by: fwang12 <fwang12@ebay.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>

kyuubi-common/src/test/scala/org/apache/kyuubi/KerberizedTestHelper.scala

@@ -95,6 +95,8 @@ trait KerberizedTestHelper extends KyuubiFunSuite {
         if (s.contains("libdefaults")) {
           rewritten = true
           s + addedConfig
+        } else if (s.contains(hostName)) {
+          s + "\n" + s.replace(hostName, s"tcp/$hostName")
         } else {
           s
         }).filter(!_.trim.startsWith("#")).mkString(System.lineSeparator())

kyuubi-server/src/main/scala/org/apache/kyuubi/server/KinitAuxiliaryService.scala

@@ -45,8 +45,12 @@ class KinitAuxiliaryService() extends AbstractService("KinitAuxiliaryService") {
 
       require(keytab.nonEmpty && principal.nonEmpty, "principal or keytab is missing")
       UserGroupInformation.loginUserFromKeytab(principal.get, keytab.get)
+      val krb5Conf = Option(System.getProperty("java.security.krb5.conf"))
+        .orElse(Option(System.getenv("KRB5_CONFIG")))
+        .getOrElse("/etc/krb5.conf")
       val commands = Seq("kinit", "-kt", keytab.get, principal.get)
       val kinitProc = new ProcessBuilder(commands: _*).inheritIO()
+      kinitProc.environment().put("KRB5_CONFIG", krb5Conf)
       kinitTask = new Runnable {
         override def run(): Unit = {
           val process = kinitProc.start()