The tdoc_ucp::OfficeDocumentsManager lives until the service manager
is disposed on shutdown, but if the database stuff isn't disposed in due
time then a document may call the notifyClosing() on the listener after
the OfficeDocumentsManager dies; probably something is leaking the
ODatabaseContext...

Change-Id: I59662b910589d7270697452b2f4ca6c960d22f22