Update instead of replace the ssh host keys

Author: danielporto

play-load-node-credentials.yml

@@ -10,4 +10,4 @@
   become: no
   tasks:
     - name: run keyscan to add keys of remote hosts to local known_hosts
-      local_action: shell ssh-keyscan {{ inventory_hostname }} > ~/.ssh/known_hosts
+      local_action: shell ssh-keyscan {{ inventory_hostname }} >> ~/.ssh/known_hosts