[rfc][icedtea-web] Fixing PR722: unsigned entries should be ignored in META-INF/

[Adam Domurad]

So afaik the consensus is that this doesn't cause security problems, and
is the behaviour of Oracle's plugin, thus here is a simple patch. I have
done some testing with dropping unsigned files into the META-INF/, and
everything seems to be in working order.

ChangeLog:
2012-06-12  Adam Domurad  <adomurad at redhat.com>

	Fixes PR722, javaws failing to run with unsigned content in META-INF/
	* netx/net/sourceforge/jnlp/tools/JarCertVerifier.java: Changed
	isSignatureRelated => isMetaInfFile. Now all files under META-INF/ are
	disregarded in checking the jar signage.
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