[rfc][icedtea-web] Ignore invalid .jar files in applets

[Adam Domurad]

Hey all. Second try at a patch to ignore invalid .jar files, this time
only affecting applets (ie, not pages that use jnlp_href).

The proprietary plug-in seems to just skip over any malformed .jar files
and carry on loading in, while in applets. This patch emulates that
behaviour. Pages with jnlp_href still crash with a ZipException on jar
verification (the proprietary plugin also fatally errors).

This alleviates some of the symptoms of
http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1011 
Once this patch has been accepted in some form, I hope to make it so
that the plugin will parse folders differently than jar files and look
for resources in folders like the proprietary plug-in does.

Le ChangeLog:
2012-05-28  Adam Domurad <adomurad at redhat.com>

	Ignore invalid jar files in applets, like the oracle plugin does.
	* netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java: 
	(isValidJar): New, checks for ZipException in new JarFile(...)
	(shouldIgnoreInvalidJars): New, checks if we are in an applet
	(initializeResources): if 'shouldIgnoreInvalidJars()' is true and a jar
	is not a valid jar file, the jar is filtered out and normal execution 
	continues.

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