RFR: 8157716: jdk.internal.loader.ClassLoaders.addURLToUCP() should return converted real path URL

[Jiangli Zhou]

Hi,

Please review the following webrev that changes the 
jdk.internal.loader.ClassLoaders.addURLToUCP() to 
java.internal.loader.ClassLoaders.toFileURL(). The change is provided by Alan 
(thanks, Alan!).

webrev: http://cr.openjdk.java.net/~jiangli/8157716/webrev.00/
but: https://bugs.openjdk.java.net/browse/JDK-8157716

Thanks,
Jiangli