Apply Authorization headers in Job instead of in each Job implementation.
Summary:
Currently each Job adds the Authorization header, this patch centralizes this operation in Job.
See D19948 DRAFT Add Standard Query Parameters support for previous discussions.
Reviewers: dvratil
Reviewed By: dvratil
Subscribers: kde-pim, LibKGAPI
Differential Revision: https://phabricator.kde.org/D20883