Summary: Added API to track bootclasspath modification
Reviewed-by: jiangli, dholmes, minqi

Summary: Implemented the interface in sun.misc.URLClassPath and corresponding JVM_XXX APIs
Reviewed-by: mchung, acorn, jiangli, dholmes

Summary: Misplacement of #if INCLUE_CDS, typos, unnecessary C string duplication
Reviewed-by: dholmes, ccheung

Summary: Cleaned up CDS to be more configurable, maintainable and extensible
Reviewed-by: dholmes, coleenp, acorn, mchung