[Merge] lp:~phablet-team/history-service/fix_qtdbus_5.6 into lp:history-service/staging

[Gustavo Pichorim Boiko]

> Tests are not aligned with telepathy 0.9.7
> 
> A question: Why is it needed register the service after the object?

So, QtDBus's internal implementation is now using threads, so if you call registerService(), it takes effect immediately (which would cause the service to be exposed on DBus without having all the required objects registered). That's why now we have to register all objects before registering the service on DBus.
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https://code.launchpad.net/~phablet-team/history-service/fix_qtdbus_5.6/+merge/309398
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