RFR: JDK-8206007: nsk/jdb/exclude001 test is taking a long time on some builds

[Gary Adams]

A simple test run using "exclude none" shows 625K methods are being 
observed.
The bulk of those methods were due to the last class accessed in the 
test - VirtualMachineManager.

It's not important that this particular call is used. The test is simply 
demonstrating that
filters work for other packages than java and javax.

This proposed fix uses a simpler lookup for GregorianCalendar.

   Issue: https://bugs.openjdk.java.net/browse/JDK-8206007
   Webrev: http://cr.openjdk.java.net/~gadams/8206007/webrev.00/