RFR 8062303: Remove com.sun.tracing API

[Jaroslav Bachorik]

Please, review the following removal of functionality
Issue : https://bugs.openjdk.java.net/browse/JDK-8062303
Webrev: http://cr.openjdk.java.net/~jbachorik/8062303/webrev.00

This API was introduced in JDK7 and immediately made 
proprietary/unsupported [1]. It didn't see any uptake since then. It'll 
not be accessible when it moves to modules.

The proposed solution is to drop this proprietary API completely.

Thanks,

-JB-