Summary: Add new methods in ManagementFactory class to obtain platform MXBeans
Reviewed-by: alanb, dfuchs, emcmanus

Summary: Add a null check for the VM option string
Reviewed-by: alanb, tbell

Reviewed-by: emcmanus, dfuchs

Summary: The JvmMemPoolEntryImpl must use the row index when caching data.
Reviewed-by: jfdenise