RFR (XL) 8046070 - Class Data Sharing clean up and refactoring, round #2

[Ioi Lam]

Hi Folks,

Please review the following clean up and refactoring of the CDS code, 
for JDK9

     http://cr.openjdk.java.net/~iklam/8046070-cds-cleanup-v2/
https://bugs.openjdk.java.net/browse/JDK-8046070

Summary of fix:

     Clean up and refactor the Class Data Sharing (CDS) code, including:

     + Improve archive integrity checking
     + Support bytecode verification during archive dumping time
     + Allow the user to configure the CDS class list and archive file.
     + Allow future extension of the CDS class loading mechanism.

Tests:

     JPRT
     UTE (vm.runtime.testlist, vm.quick.testlist, 
vm.parallel_class_loading.testlist)
     Various adhoc SQE tests on Aurora
     JCK

Thanks
- Ioi