RFR: JDK-8160728: Update compare script to clean baseline

[Tim Bell]

Erik:

> Several things have happened recently that affect the compare script's 
> ability to do clean comparisons for build change verification.
>
> * The SystemModules.class has even more randomness in it and it 
> currently doesn't look like it can be reliably compared at all.
> * The new lib/classlist file may have lines in different order between 
> builds.
> * Support comparing the new licensee-src build mode.
>
> By fixing this I'm again able to do a full -testset buildinfra JPRT 
> COMPARE_BUILD build using an empty patch and get a clean result.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8160728
> Webrev: http://cr.openjdk.java.net/~erikj/8160728/webrev.top.01/

Looks good to me.

/Tim