[rfc][icedtea-web] fixed

[Jiri Vanek]

Those two tests stared to fail recently, and it appeared they wer enot testing what they were 
pretending to test.

They were pretending to test /tmp/cache_file, but in fact were testing the real cache file.

This patch is fixing it, by exposing a bit two variables with cached 
JNLPRuntime.getConfiguration().getProperty(DeploymentConfiguration.KEY_USER_CACHE_DIR); value.

As one of the cached variables is opened properties file, then I'm not for fixing it better == do 
not cache the value.

Also the test is now cleaning a biut after itself.

J.


and of course the unlucky
@@ -195,8 +195,6 @@
      }

      private String getIdForCacheFolder(String folder) {
-        System.out.println(folder);
-        System.out.println(cacheDir);
          int len = cacheDir.length();
          int index = folder.indexOf(File.separatorChar, len + 1);
          return folder.substring(len + 1, index);
so not belongs here as those two lines from previous "push" it will not be pusheed in final push.
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