Update reflect2 to 1.0.1 (memory utilization fix)
Update reflect2 to 1.0.1 (memory utilization fix)

Picking up https://github.com/modern-go/reflect2/pull/2 which lazy
initializes a map of all types which we don't use in k8s, saving
memory & initialization time.

Kubernetes-commit: 970e4da4c6636b835175dc79a7492d22dc11ba33

kubernetes-nightly/sample-apiserver,kubernetes/sample-apiserver,kubernetes-nightly/sample-apiserver,kubernetes/sample-apiserver