Update pre_requisites.yml

Signed-off-by: sakshiarora13 <sakshi_arora1@dell.com>

control_plane/roles/control_plane_sm/tasks/pre_requisites.yml

@@ -45,5 +45,6 @@
   copy:
     src: "{{ opensm_conf_file }}"
     dest: "{{ opensm_conf_file_dest }}"
+    mode: preserve
     force: yes
-  tags: install
+  tags: install