Review request (XS): 7037081 "Remove com.sun.tracing from NON_CORE_PKGS"

[Mandy Chung]

  Jon, Kelly,

Can you review the fix for 7037081: Remove com.sun.tracing from 
NON_CORE_PKGS

This fix removes the generation of javadoc for this package and adds 
com.sun.tracing to the javac's legacy.properties that javac will issue 
warnings of any use.

Webrev at:
    http://cr.openjdk.java.net/~mchung/jdk7/7037081/webrev.01/

Thanks
Mandy