generate ssh key pair

Change-Id: I9f7cbdb0ba9379eed262cc211a5eff2be5b05f8a
diff --git a/roles/head-node/templates/compute-node-vars.yml.j2 b/roles/head-node/templates/compute-node-vars.yml.j2
index 10bc4e0..0ece477 100644
--- a/roles/head-node/templates/compute-node-vars.yml.j2
+++ b/roles/head-node/templates/compute-node-vars.yml.j2
@@ -1,3 +1,6 @@
+{% if compute_node.password is defined and compute_node.password != omit %}
+password_compute_node: '{{ compute_node.password }}'
+{% endif %}
 {% if compute_node.fabric.include.names is defined and compute_node.fabric.include.names != omit %}
 fabric_include_names: '{{ compute_node.fabric.include.names }}'
 {% endif %}