Refactor PodCondition to PodPhase
Rename makeContainerKey -> make BoundPodsKey.

Fix some typos too.
Merge pull request #2522 from markturansky/v1beta3_podphaserefactor

Refactor PodCondition to PodPhase
Merge pull request #2525 from erictune/cleanup1

Rename makeContainerKey -> make BoundPodsKey.
Add helper for making simple selector.
Remove never-needed return value.

Make some types private.