Use MaaS node key when on_maas

Change-Id: Ie5708aac996647ee532d33a82ec5e9af468645a8
(cherry picked from commit 057a8833bb8f5627ed2c05a307ae4149f3131020)
diff --git a/roles/xos-vm-install/files/xos-setup-cord-pod-playbook.yml b/roles/xos-vm-install/files/xos-setup-cord-pod-playbook.yml
index 8a99769..f2724cb 100644
--- a/roles/xos-vm-install/files/xos-setup-cord-pod-playbook.yml
+++ b/roles/xos-vm-install/files/xos-setup-cord-pod-playbook.yml
@@ -46,7 +46,7 @@
 
     - name: copy over SSH key as node_key
       copy:
-        src=~/.ssh/id_rsa
+        src={{ node_private_key }}
         dest={{ service_profile_repo_dest }}/{{ xos_configuration }}/node_key
 
     - name: Download Glance VM images
@@ -76,4 +76,3 @@
         chdir="{{ xos_repo_dest }}/containers/xos/"
       with_items:
        - base
-