Support k8s 1.27: Remove unsupported kubelet arg

This argument has been defined for containerd clusters in Magnum, and is set to
the default (and only valid) value of 'remote'.

Kubelet warning in 1.26:
  * Flag --container-runtime has been deprecated, will be removed in 1.27 as the only valid value is 'remote'
Kubelet error in 1.27:
  * E0801 03:10:26.723998    8889 run.go:74] "command failed" err="failed to parse kubelet flag: unknown flag: --container-runtime"

Change-Id: I072fab1342593941414b86e28b8a76edf2b19a6f

magnum/drivers/common/templates/kubernetes/fragments/configure-kubernetes-master.sh

@@ -500,7 +500,6 @@ KUBELET_ARGS="${KUBELET_ARGS} --client-ca-file=${CERT_DIR}/ca.crt --tls-cert-fil
 KUBELET_ARGS="${KUBELET_ARGS} --cgroup-driver=${CGROUP_DRIVER}"
 if [ ${CONTAINER_RUNTIME} = "containerd" ] ; then
  KUBELET_ARGS="${KUBELET_ARGS} --runtime-cgroups=/system.slice/containerd.service"
- KUBELET_ARGS="${KUBELET_ARGS} --container-runtime=remote"
  KUBELET_ARGS="${KUBELET_ARGS} --runtime-request-timeout=15m"
  KUBELET_ARGS="${KUBELET_ARGS} --container-runtime-endpoint=unix:///run/containerd/containerd.sock"
 fi

magnum/drivers/common/templates/kubernetes/fragments/configure-kubernetes-minion.sh

@@ -276,7 +276,6 @@ KUBELET_ARGS="${KUBELET_ARGS} --client-ca-file=${CERT_DIR}/ca.crt --tls-cert-fil
 KUBELET_ARGS="${KUBELET_ARGS} --cgroup-driver=${CGROUP_DRIVER}"
 if [ ${CONTAINER_RUNTIME} = "containerd" ] ; then
  KUBELET_ARGS="${KUBELET_ARGS} --runtime-cgroups=/system.slice/containerd.service"
- KUBELET_ARGS="${KUBELET_ARGS} --container-runtime=remote"
  KUBELET_ARGS="${KUBELET_ARGS} --runtime-request-timeout=15m"
  KUBELET_ARGS="${KUBELET_ARGS} --container-runtime-endpoint=unix:///run/containerd/containerd.sock"
 fi