[rfc] [icedtea-web] cleaning XML logging from wrong character

[Jiri Vanek]

Epiphany is littel bit confuse dby JS<->applet tests and is returning negative, zero  or to high 
retyped chars.
Those chars break xml processing, so I would like to get them out from xml by this patch (kept in 
plain text).

Also I have realised I have broken unittest logging some tie ago. Fixed also:(

J.
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