Use Go canonical import paths

Add canonical imports only in existing doc.go files.
https://golang.org/doc/go1.4#canonicalimports

Fixes #29014

pkg/kubelet/lifecycle/doc.go

@@ -16,4 +16,4 @@ limitations under the License.
 
 // Handlers for pod lifecycle events and interfaces to integrate
 // with kubelet admission, synchronization, and eviction of pods.
-package lifecycle
+package lifecycle // import "k8s.io/kubernetes/pkg/kubelet/lifecycle"