RFR (XL) 8046070 - Class Data Sharing clean up and refactoring, round #1

[Ioi Lam]

Hi Folks,

Please review a the following clean up and refactoring of the AppCDS code
    http://cr.openjdk.java.net/~iklam/8046070-cds-cleanup-v1/
    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 (hotspot only, and jdk)
    UTE (vm.runtime.testlist, vm.quick.testlist, 
vm.parallel_class_loading.testlist)

Thanks
- Ioi