[RFC][netx]: fix memory leak introduced by my previous changeset.

[Denis Lila]

Hi.

I just realized that my previous changeset was not ideal.
It created a new thread group object for every NetxPanel,
but it only created any threads in that thread group if
a thread group had not already been created for that panel.

This can result in creating unused ThreadGroups. That's
not a problem by itself - the problem is that they're not
garbage collected even if they're unused (because they're
created with a non null parent, and the parent keeps track
of them in an internal list). This is effectively a (very small)
memory leak.

The patch to fix this is attached. It just replaces the
concurrent map with synchronized statements.

Ok to push?

Regards,
Denis.
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