[vbox-dev] Fix to #13789

[a.urakov at drweb.com]

Hello!

We would like to contribute to VirtualBox under MIT license. We send our 
changes to fix bug described at https://www.virtualbox.org/ticket/13789 .

The idea is that functions /Medium::removeRegistry()/ and 
/Medium::addRegistry()/ themselves take write locks on mediums, so we 
get read lock only for /Medium::getAnyMachineBackref()/ call in 
/VirtualBox::unregisterMachine()/ function. Also we release read lock on 
medium after we got its parent and before we are going to iterate 
through parents in /Machine::detachAllMedia()/ function.

Regards,
Alexander

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