Build JSON API changes
New plugin:
- `orchestrate_build` (buildstep)
- `koji_tag_build` (exit)
Bug Fixes
- Fix for possible incorrect tag names for images
- fix a problem in pulp_sync plugin where an image was generated without a namespace (671)
- print image names in pulp_sync or in pulp_push once - whichever comes later
- add_filesystem: arch is no longer hardcoded
- pulp_push: dockpulp now honors logging level
Improvements
- New plugin `orchestrate_build` was added, will create worker build
(via OSBS method `create_worker_build`),
and will as well pass it build_image used for orchestrator
- New plugin `koji_tag_build` was added, will tag build only when
build was successfully promoted and its metadata updated