Previous discussion: https://github.com/openshift/origin/issues/9339

Conditions are more powerful than Phases and can contain more information about the state of a build at a point of time.

when doing this we can provide more fine-grained build status updates:
For each stage/step of a build:

1. Fetch source (include Binary build uploads).
2. Pull Images
3. Assemble injections
4. Build image/run assemble Generate Dockerfile (s2i)
5. Run Build
6. Push new image
7. Build pod states (created, running - need to ensure this doesn't overlap with existing phases/conditions)

Open question - do we want to add additional conditions to the metrics exposed by Prometheus? Currently uses phases.