[SPARK-20667][SQL][TESTS] Cleanup the cataloged metadata after comple…

…ting the package of sql/core and sql/hive

## What changes were proposed in this pull request?

So far, we do not drop all the cataloged objects after each package. Sometimes, we might hit strange test case errors because the previous test suite did not drop the cataloged/temporary objects (tables/functions/database). At least, we can first clean up the environment when completing the package of `sql/core` and `sql/hive`.

## How was this patch tested?
N/A

Author: Xiao Li <gatorsmile@gmail.com>

Closes #17908 from gatorsmile/reset.

(cherry picked from commit 0d00c76)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala

@@ -1251,9 +1251,10 @@ class SessionCatalog(
         dropTempFunction(func.funcName, ignoreIfNotExists = false)
       }
     }
-    tempTables.clear()
+    clearTempTables()
     globalTempViewManager.clear()
     functionRegistry.clear()
+    tableRelationCache.invalidateAll()
     // restore built-in functions
     FunctionRegistry.builtin.listFunction().foreach { f =>
       val expressionInfo = FunctionRegistry.builtin.lookupFunction(f)

sql/core/src/test/scala/org/apache/spark/sql/test/SharedSQLContext.scala

@@ -74,6 +74,7 @@ trait SharedSQLContext extends SQLTestUtils with BeforeAndAfterEach with Eventua
   protected override def afterAll(): Unit = {
     super.afterAll()
     if (_spark != null) {
+      _spark.sessionState.catalog.reset()
       _spark.stop()
       _spark = null
     }

sql/hive/src/main/scala/org/apache/spark/sql/hive/test/TestHive.scala

@@ -488,14 +488,9 @@ private[hive] class TestHiveSparkSession(
 
       sharedState.cacheManager.clearCache()
       loadedTables.clear()
-      sessionState.catalog.clearTempTables()
-      sessionState.catalog.tableRelationCache.invalidateAll()
-
+      sessionState.catalog.reset()
       metadataHive.reset()
 
-      FunctionRegistry.getFunctionNames.asScala.filterNot(originalUDFs.contains(_)).
-        foreach { udfName => FunctionRegistry.unregisterTemporaryUDF(udfName) }
-
       // HDFS root scratch dir requires the write all (733) permission. For each connecting user,
       // an HDFS scratch dir: ${hive.exec.scratchdir}/<username> is created, with
       // ${hive.scratch.dir.permission}. To resolve the permission issue, the simplest way is to