Change CNI config directory to /etc/cni/net.d

* Change CNI config directory from `/etc/kubernetes/cni/net.d`
to `/etc/cni/net.d` (Kubelet default)
* https://github.com/poseidon/terraform-render-bootstrap/pull/255

google-cloud/flatcar-linux/kubernetes/cl/controller.yaml

@@ -56,7 +56,7 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.5
-        ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
+        ExecStartPre=/bin/mkdir -p /etc/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
         ExecStartPre=/bin/mkdir -p /var/lib/calico
@@ -67,6 +67,7 @@ systemd:
           --privileged \
           --pid host \
           --network host \
+          -v /etc/cni/net.d:/etc/cni/net.d:ro \
           -v /etc/kubernetes:/etc/kubernetes:ro \
           -v /etc/machine-id:/etc/machine-id:ro \
           -v /usr/lib/os-release:/etc/os-release:ro \
@@ -87,7 +88,6 @@ systemd:
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
-          --cni-conf-dir=/etc/kubernetes/cni/net.d \
           --healthz-port=0 \
           --kubeconfig=/var/lib/kubelet/kubeconfig \
           --network-plugin=cni \