[RFC] Netx: setting context classloader properly for all threads

[Man Wong]

This patch forces the creation of Event Awt thread before the thread
launching the application sets the contextclassloader for itself,
and its child(ren). This essentially make sure Event Awt thread gets
the correct contextclassloader. 

It also fixes along with changesets
4bcc2702e0ec and 867af494861c the issue with launching the set of
simulation applications mentioned in icedtea bug 486 (which
effectively allows us to close that bug).

Ok to push?

Thanks,
Man Lung Wong
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