[rfc][icedtea-web] unittests' stdout/err silencer

[Jiri Vanek]

Once "[rfc][icedtea-web] allow access to jars' attributes from jnlpfile class" is pushed, few tests 
will start to disturb stdout/err.

This simple patch will silence them. If/after:) "Re: [rfc][icedtea-web] allow access to jars' 
attributes from jnlpfile class"  will go to 1.4 then something similar (stdout/err redirection) will 
go here to.

The disturbing message is recommended by specification, I do not wont to add specific switches for 
individual logging streams.

J.
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