Given the slow migration of everything to the shared project config in
tools that change project contexts multiple times a consistent way of
accessing the config without forcing remote calls is needed.
As the remote config is no longer optional for SLE and is utilized by
openSUSE to the point were it is dangerous not to load the remote config
it should be required. Currently only certain users call apply_remote()
while this will make it built-in during construction and thus makes the
usage consistent and no longer require StagingAPI.
