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

Change-Id: I0bab86e0207edb12f553ddcfe040882f04f34f25
diff --git a/roles/compute-node/tasks/main.yml b/roles/compute-node/tasks/main.yml
index fe2b1ae..fb5b9bb 100644
--- a/roles/compute-node/tasks/main.yml
+++ b/roles/compute-node/tasks/main.yml
@@ -108,7 +108,7 @@
 - name: Ensure SSH Key Pair
   become: yes
   copy:
-    src: "/etc/maas/.ssh/{{item.src}}"
+    src: "{{pub_ssh_key_file_location}}/{{item.src}}"
     dest: "{{ansible_env['PWD']}}/.ssh/{{item.dest}}"
     owner: "{{ ansible_user_id }}"
     group: "docker"