[RFC][icedtea-web] Fix usage of == -> .equals for various String comparisons

[Adam Domurad]

Thanks Jiri, Deepak, Pavel for reviewing my patch!

I have fixed the issues previously state, except for the constant extraction suggestion. 

Here are the updated Changelog and patch file.

Changelog:
2012-05-16  Adam Domurad  <adomurad at redhat.com>

	Fixed uses of == to compare String objects to .equals where 
	appropriate.
	Noted a non-obvious use of == to compare a 'magic' String reference.
	* netx/net/sourceforge/jnlp/JNLPFile.java:
	Changed calls that compare String contents from == to .equals
	* plugin/icedteanp/java/sun/applet/GetMemberPluginCallRequest.java: 
	Same
	* plugin/icedteanp/java/sun/applet/PluginCallRequestFactory.java:
	Same
	* netx/net/sourceforge/jnlp/Version.java: Added comment explaining why
	== was used vs .equals
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