Report the commit data fetch result, including success state and error
message, through the QFuture. That also removes the need for creating a
fetcher QObject and the logic to make sure it is deleted.
Also exchange QtConcurrent::run by Utils::runAsync.

Change-Id: I9c0c03eff2eaa32f577b4599ffda58b0c09de59b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>