chore(depot): rename '.priv.key' file to '.key' file
chore(depot): rename '.priv.key' file to '.key' file

kingoftowns/etcd-ca,oscarrr110/etcd-ca,endocode/etcd-ca,endocode/etcd-ca,oscarrr110/etcd-ca,hzy001/etcd-ca,kingoftowns/etcd-ca,coreos/etcd-ca,hzy001/etcd-ca,coreos/etcd-ca