QNetworkSession has a concept of UsagePolicy which can disable
background* transfers to conserve battery or bandwidth. However, it is
only possible to change the policy through
QNetworkSessionPrivate::setUsagePolicy which currently doesn't have any
callers outside of our auto tests.
*background = transfers not initiated directly by the user, but needs
to be marked as such by the application developer.
Change-Id: I92c4abccaca040612b4795abe7c52d68a2d21749
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
682e4795fe