[MINOR] Ignore test with external dependencies

There are intermitent failure when downloading external
java based jar for testing %addJar functionality.
diff --git a/scala-interpreter/src/test/scala/integration/interpreter/scala/AddExternalJarMagicSpecForIntegration.scala b/scala-interpreter/src/test/scala/integration/interpreter/scala/AddExternalJarMagicSpecForIntegration.scala
index b6834e1..5fe29ff 100644
--- a/scala-interpreter/src/test/scala/integration/interpreter/scala/AddExternalJarMagicSpecForIntegration.scala
+++ b/scala-interpreter/src/test/scala/integration/interpreter/scala/AddExternalJarMagicSpecForIntegration.scala
@@ -91,7 +91,7 @@
         outputResult.reset()
       }
 
-      it("should support Scala jars") {
+      ignore("should support Scala jars") {
         val locationURL = "http://repo1.maven.org/maven2/org/scala-rules/rule-engine-core_2.11/0.5.1/rule-engine-core_2.11-0.5.1.jar"
         val testJarUrl = JarUtils.downloadJar(tempdir.toString, locationURL)