Revert "[SPARK-23831][SQL] Add org.apache.derby to IsolatedClientLoader"

This reverts commit a75571b.

Author: HyukjinKwon

sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala

@@ -182,7 +182,6 @@ private[hive] class IsolatedClientLoader(
     name.startsWith("org.slf4j") ||
     name.startsWith("org.apache.log4j") || // log4j1.x
     name.startsWith("org.apache.logging.log4j") || // log4j2
-    name.startsWith("org.apache.derby.") ||
     name.startsWith("org.apache.spark.") ||
     (sharesHadoopClasses && isHadoopClass) ||
     name.startsWith("scala.") ||

sql/hive/src/test/scala/org/apache/spark/sql/hive/HiveExternalCatalogSuite.scala

@@ -113,10 +113,4 @@ class HiveExternalCatalogSuite extends ExternalCatalogSuite {
     catalog.createDatabase(newDb("dbWithNullDesc").copy(description = null), ignoreIfExists = false)
     assert(catalog.getDatabase("dbWithNullDesc").description == "")
   }
-
-  test("SPARK-23831: Add org.apache.derby to IsolatedClientLoader") {
-    val client1 = HiveUtils.newClientForMetadata(new SparkConf, new Configuration)
-    val client2 = HiveUtils.newClientForMetadata(new SparkConf, new Configuration)
-    assert(!client1.equals(client2))
-  }
 }