Use a uniform way to get the local path of the binaries (#10211)

Signed-off-by: bo.jiang <bo.jiang@daocloud.io>

roles/kubernetes/node/tasks/install.yml

@@ -1,7 +1,7 @@
 ---
 - name: install | Copy kubeadm binary from download dir
   copy:
-    src: "{{ local_release_dir }}/kubeadm-{{ kubeadm_version }}-{{ image_arch }}"
+    src: "{{ downloads.kubeadm.dest }}"
     dest: "{{ bin_dir }}/kubeadm"
     mode: 0755
     remote_src: true
@@ -12,7 +12,7 @@
 
 - name: install | Copy kubelet binary from download dir
   copy:
-    src: "{{ local_release_dir }}/kubelet-{{ kube_version }}-{{ image_arch }}"
+    src: "{{ downloads.kubelet.dest }}"
     dest: "{{ bin_dir }}/kubelet"
     mode: 0755
     remote_src: true