Copy keys for tripleo-admin user

Change-Id: Iab64473d2b5ccc910d226fc6bec06c73f43515b8
Partial-Bug: #1824326
(cherry picked from commit d2fae913d9)

deployment/mistral/mistral-executor-container-puppet.yaml

@@ -221,6 +221,7 @@ outputs:
             mode: 0700
         - name: copy tripleo-admin private key to /var/lib/mistral/.ssh
           copy:
+            remote_src: yes
             src: /home/{{ tripleo_admin_user }}/.ssh/id_rsa
             dest: /var/lib/mistral/.ssh/{{ tripleo_admin_user }}-rsa
             mode: 0600