Sanitize the uuid string for ceph-ansible

dmidecode can return some additional data if SMBIOS is updated; this
ensures output matches the UUID format.

Change-Id: I5c61c0049bfd16114894cf4db3b79f94b6d9291b
Related-Bug: 1762460

docker/services/ceph-ansible/ceph-base.yaml

@@ -446,7 +446,8 @@ outputs:
                         set_fact:
                           nodes_data: "{% raw %}{{ lookup('file','./nodes_uuid_data.json') | from_json  }}{% endraw %}"
                       - name: register machine id
-                        command: dmidecode -s system-uuid | tr A-F a-f
+                        # awk strips unwanted output, see LP bug #1762460
+                        shell: dmidecode -s system-uuid | awk 'match($0, /[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}/) { print substr($0, RSTART, RLENGTH) }' | tr A-F a-f
                         register: machine_uuid
                         # NOTE(tonyb): 0 == no error, 1 == -EPERM or bad data and 2 == Command not found
                         # 1 and 2 aren't great but shouldn't cause the deploy to fail.  If we're using