RFR: Here are some URLClassPath patches

Wed Feb 28 23:58:01 UTC 2018

OK, that was weird...
All I did for testing was follow

// This section should be uncommented if 8026517 is fixed.

but ...  8026517 is marked fixed!

So switching to ArrayDeque accidentally fixed 8026517 for real?!

8198810: URLClassLoader does not specify behavior when URL array contains
null
http://cr.openjdk.java.net/~martin/webrevs/jdk/URLClassLoader-NPE/
https://bugs.openjdk.java.net/browse/JDK-8198810