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/server/stats/doc.go

@@ -17,4 +17,4 @@ limitations under the License.
 // Package stats handles exporting Kubelet and container stats.
 // NOTE: We intend to move this functionality into a standalone pod, so this package should be very
 // loosely coupled to the rest of the Kubelet.
-package stats
+package stats // import "k8s.io/kubernetes/pkg/kubelet/server/stats"