[rfc][icedtea-web] Fix regression in SpacesCanBeEveryWhere reproducer

[Adam Domurad]

2013-XX-XX  Adam Domurad  <adomurad at redhat.com>

     * netx/net/sourceforge/jnlp/cache/ResourceTracker.java
     (getCacheFile): Use decodeUrlAsFile instead of toURI().getPath().
     * netx/net/sourceforge/jnlp/util/UrlUtils.java
     (decodeUrlAsFile): New, tolerates ill-formed URLs.
     * tests/netx/unit/net/sourceforge/jnlp/util/UrlUtilsTest.java:
     (testDecodeUrlAsFile): Test for (decodeUrlAsFile)

Sorry this wasn't caught sooner, and thanks to Jiri for pointing it out.
The problem was that archives can't be guaranteed to be encoded URLs.
We instead use an encoding-tolerant function.

Note that the headache is caused because Java allows essentially invalid 
URLs to be created (and, on our side, that we allow them to be created).

Happy hacking,
-Adam
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