Remove LivenessProbe.Type in v1beta3
Add PodIP and Image to v1beta3

Fixes #2900
Remove internal PodState in favor of internal PodStatus object
Conversions missing from v1beta1

They were in v1beta2, not sure how they got removed.
Merge pull request #2912 from smarterclayton/small_v1beta3_refactors_2

More small refactors for v1beta3 -> internal