1) Use OCI Image Specs for labels instead of custom 'commit-id=xxxxx'
or legacy "Label Schema"
2) Fix missing git commit id labels on images (.revision)
3) Add human-readable title (.title) of the image, URL (.url), and
a few other properties (annotations) according to the latest Specs
Change-Id: I7029d7caf521c7f56c1046fff9ecdd4e81090618