RFR 8080663: Use sun.misc.SharedSecrets to allow access from java.management to @ConstructorProperties

[Jaroslav Bachorik]

Please, review the following change

Issue : https://bugs.openjdk.java.net/browse/JDK-8080663
Webrev: http://cr.openjdk.java.net/~jbachorik/8080663/webrev.00
The title says it all. This enhancement is about replacing the arbitrary 
reflection based code with a cleaner approach based on 
sun.misc.SharedSecrets class.

Thanks,

-JB-