RFR 8165793 : Provide an API to query if a ClassLoader is parallel capable

[Brent Christian]

Hi,

Please review my fix for 8165793.  This follows the discussion here:
http://mail.openjdk.java.net/pipermail/jigsaw-dev/2016-September/009328.html

The proposal is to add a new public method on ClassLoader:

/**
  * Returns {@code true} if this class loader is
  * {@linkplain #registerAsParallelCapable parallel capable}, otherwise
  * {@code false}.
  *
  * @return  {@code true} if this class loader is parallel capable,
  *          otherwise {@code false}.
  * @since   9
  */
public final boolean isParallelCapable();

Bug:
https://bugs.openjdk.java.net/browse/JDK-8165793
Webrev:
http://cr.openjdk.java.net/~bchristi/8165793/webrev.00/

Thanks!

-Brent