[rfc][icedtea-web] Add helper for getting NetxPanel's by unique key

[Adam Domurad]

Hi all. This mostly makes sense in the context of a patch that Jiri 
Vanek is working on. This adds a missing piece needed to operate on all 
NetxPanel's with a given unique key.

To get the NetxPanel's from 
UnsignedAppletTrustConfirmation.checkUnsignedWithUserIfRequired just do:

List<NetxPanel> appletPanels = 
PluginAppletViewer.getAppletPanelsWithUniqueKey(file.getUniqueKey());

ChangeLog:
2013-06-03  Adam Domurad  <adomurad at redhat.com>

         * netx/net/sourceforge/jnlp/NetxPanel.java
         (getUniqueKey): New, returns applet unique key.
         (getThreadGroup): Use getUniqueKey.
         (NetxPanel): Use getUniqueKey.
         * plugin/icedteanp/java/sun/applet/PluginAppletViewer.java:
         (getAppletPanelsWithUniqueKey): New, get all applet panels with a
         given unique key.

Pushing probably depends on how useful it is to Jiri.

Happy hacking,
-Adam
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