[RFC][netx]: unsafe write to HashMap

[Denis Lila]

Hi.

I think I found a concurrency problem in
ResourceTracker.addResource. This method is not static.
It is called from different threads, and it writes to
downloadOptions which is a static HashMap. This is not
safe. The patch uses a ConcurrentHashMap. That should
be enough to fix it.

Ok to push?

Regards,
Denis.
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