update some roles to update software versions and bug fixes

Change-Id: I0e1436d670efdc561b527ed93d4f0f2330c50c77
diff --git a/roles/compute-node/tasks/main.yml b/roles/compute-node/tasks/main.yml
index f8edc77..7bf99ab 100644
--- a/roles/compute-node/tasks/main.yml
+++ b/roles/compute-node/tasks/main.yml
@@ -10,6 +10,7 @@
   user:
     name={{ ansible_user }}
     password="$6$TjhJuOgh8xp.v$z/4GwFbn5koVmkD6Ex9wY7bgP7L3uP2ujZkZSs1HNdzQdz9YclbnZH9GvqMC/M1iwC0MceL05.13HoFz/bai0/"
+  when: '"{{ ansible_user }}" == "ubuntu"'
 
 - name: Authorize SSH Key
   become: yes