[jdk8u-dev] Request for approval : 8071125: Improve exception messages in URLPermission

[Seán Coffey]

I'd like to backport this fix to jdk8u-dev. Applies cleanly.

https://bugs.openjdk.java.net/browse/JDK-8071125
jdk changeset : http://hg.openjdk.java.net/jdk9/dev/jdk/rev/a7147a466b12
review thread : 
http://mail.openjdk.java.net/pipermail/net-dev/2016-April/009715.html

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Regards,
Sean.