CORD-1551 - updated maas makefiles and multi-stage dockerfile

Change-Id: I0bab86e0207edb12f553ddcfe040882f04f34f25
diff --git a/roles/head-node/tasks/main.yml b/roles/head-node/tasks/main.yml
index 04a7e8c..8cd1f9a 100644
--- a/roles/head-node/tasks/main.yml
+++ b/roles/head-node/tasks/main.yml
@@ -131,7 +131,7 @@
 - name: Copy SSH Key Pair for POD
   become: yes
   copy:
-    src: /etc/maas/.ssh/{{item}}
+    src: "{{pub_ssh_key_file_location}}/{{item}}"
     dest: /etc/maas/.ssh/{{item}}
     owner: maas
     group: maas