generate ssh key pair

Change-Id: I9f7cbdb0ba9379eed262cc211a5eff2be5b05f8a
diff --git a/ansible/roles/common/tasks/main.yml b/ansible/roles/common/tasks/main.yml
index b7d5eb2..7084802 100644
--- a/ansible/roles/common/tasks/main.yml
+++ b/ansible/roles/common/tasks/main.yml
@@ -32,7 +32,7 @@
     state: directory
     owner: "{{ ansible_user }}"
     group: "{{ ansible_user }}"
-    mode: 0700
+    mode: "0700"
   tags: [common]
 
 - name: Ensure known_hosts file is absent
@@ -47,6 +47,6 @@
     dest: /home/{{ ansible_user }}/.ssh/config
     owner: "{{ ansible_user }}"
     group: "{{ ansible_user }}"
-    mode: 0600
+    mode: "0600"
   tags: [common]