all: improve Kubernetes API client

* pod creation returns an *api.Pod
* WatchPod replaces WatchPodStatus

Updates golang/go#12546

Change-Id: I34bb6e0d994e552b41a8082cc4672a663ce961a3
Reviewed-on: https://go-review.googlesource.com/17100
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed