Log output from osbuild has a very different format when using the
new schema. The osbuild1.Result object now supports unmarshalling the
new format and adapting it to the old format.
The most important field to set is the Success field to signal whether
the build succeeded.
Secondarily, it also copies over the output from each stage in order to
provide build job log output through the weldr API.
Since the new format contains multiple pipelines with multiple stages
each, the stages are flattened to fit the old format. A unique name for
each stage is created by prepending the name of the pipeline to its
index in the pipeline and its type.
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