[rfc][icedtea-web] fixing downloadservice test

[Jiri Vanek]

This was actually really bug in ITW casued by 2 yeas old refactoring inside classloader - 
http://icedtea.classpath.org/hg/icedtea-web/rev/a9e1b9e256cf Blamelist is CCed :)

I have also  investigated  other failures from that time and rest is ok.

This fix should be valid for 1.4 up to head!

J.
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