Add "image_name" and "stream_optimized" fields to the osbuild job as
replacement for the local target options. The former signifies the name
of the uploaded artifact and whether an artifact should be uploaded at
all (only weldr API). The latter will be deprecated at some point, when
osbuild itself can make streamoptimized vmdk images.
This change separates what have always been two distinct concepts:
artifacts that are reported back to the composer node (in practice
always running on the same machine), and upload targets to clouds and
such. Separating them makes it easier to add job types that only allow
one upload target while keeping artifacts.
Keep the local target around, so that jobs that are scheduled can still
be run after an upgrade.
0cd7174598