RFR 8196308: Update AllLineLocations & ClassesByName to use TestScaffold instead of JDIScaffold

[Paru Somashekar]

Hi,

Please review the fix for JDK-8196308
Bug : https://bugs.openjdk.java.net/browse/JDK-8196308
Webrev : http://cr.openjdk.java.net/~psomashe/8196308/webrev/ 
<http://cr.openjdk.java.net/%7Epsomashe/8196308/webrev/>

The updated tests ran successfully with Mach5.

thanks,
Paru.