[rfc][icedtea-web] fix (And tests) for PR1473

[Jiri Vanek]

This patch is removing the redownloading of jnlp file - both from local file and form network, and 
so fixing the  http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1473

The unhappy redownloading was added during one of inital pushes - 
http://icedtea.classpath.org/hg/icedtea-web/rev/1d604ccd9b6b  And I'm wondering why:)


J.
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