Issue GoogleCloudPlatform#4 revert to default jetty logging

jetty9-base/src/main/jetty-base/resources/jetty-logging.properties

@@ -1,19 +1,17 @@
-#
-# Copyright 2016 Google Inc. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#       http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
 
-# Direct Jetty logging to JavaUtilLog
-# see etc/java-util-logging.properties
-org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.JavaUtilLog
+## Direct Jetty logging to JavaUtilLog
+# org.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.JavaUtilLog
+
+### Configure jetty root logger level for the default StdErrLog class.  
+## Levels are OFF, DEBUG, INFO, WARN, ALL
+org.eclipse.jetty.LEVEL=INFO
+
+## If SOURCE is true, the filename and line number of the logging event origin are logged 
+org.eclipse.jetty.SOURCE=false
+
+## If STACKS is true, full stack traces for exceptions are logged
+org.eclipse.jetty.STACKS=true
+
+## If LONG is true, fully qualified package names are used rather than abbreviations
+org.eclipse.jetty.LONG=false
+