[reSIProcate] [DialogUsagManager] InMemoryRegistrationDatabase usage.

[palladin]

Dear resip devels,
resiprocate 1.9.2

I have got a crash during InMemoryRegistrationDatabase usage. Sometimes 
I need to modify ContactInstanceRecord from separate thread.  As I can 
notice from InMemoryRegistrationDatabase::updateContact sources 
ContactList is fetched and mutex is unlocked. I suppose at the same time 
my thread tries to modify the same ContactList, because it is not any 
more protected from simultaneous access. As result crash.
Could you please consider provided patch? If it is not fine - please 
advice how can I safely update ContactList?

Sincerely Taras.
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