Automatic merge from submit-queue (batch tested with PRs 38252, 41122, 36101, 41017, 41264)

Register deepcopy and defaulter funcs for metav1

Houston, we've had a problem here. ObjectMeta had used the reflection fallback path for deepcopy for probably some time.

Remark: my original plan for https://github.com/kubernetes/kubernetes/pull/36412 was/is to rebase that during the master branch freeze for 1.6 and get it merged just before master opens again. Otherwise, I fear it will be rebase hell. With https://github.com/kubernetes/kubernetes/pull/36412 these kind of errors are not possible anymore.