c-go: Update diskv to get atomic fs cache write
c-go: Update diskv to get atomic fs cache write

Kubernetes-commit: 30325cd580af08e13a0ebc89252842eb955fd94e

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