generate ssh key pair

Change-Id: I9f7cbdb0ba9379eed262cc211a5eff2be5b05f8a
diff --git a/roles/fabric-switch/tasks/main.yml b/roles/fabric-switch/tasks/main.yml
index 4e718f9..afea0ed 100644
--- a/roles/fabric-switch/tasks/main.yml
+++ b/roles/fabric-switch/tasks/main.yml
@@ -30,7 +30,7 @@
     dest: /root
     owner: root
     group: root
-    mode: 0755
+    mode: "0755"
   with_items:
     - purge
     - killit