J-146: Lower the footprint of Jersey Monitoring for apps that are not used
J-138: ExtendedMonitoringStatisticsListener is never called
J-154: NPE in TimeWindowStatisticsImpl during WLS shutdown

 - introduced empty constants
 - simple caching
 - performace test

Change-Id: Idaf92452cb69d77d6ed63cfc4802168b0a28a8e9
Signed-off-by: Michal Gajdos <michal.gajdos@oracle.com>
Merge "J-146: Lower the footprint of Jersey Monitoring for apps that are not used J-138: ExtendedMonitoringStatisticsListener is never called J-154: NPE in TimeWindowStatisticsImpl during WLS shutdown"