Request for Review (s) - 8014862:Add fast Metasapce capacity and used per MetadataType

[Jon Masamitsu]

This fix calculates the running sums for allocated capacity and
allocated used in MetaspaceAux to be  per MetaspaceType instead of
the sum of both types.

http://cr.openjdk.java.net/~jmasa/8014862/webrev.00/