Use UUID for mounted SwiftRawDisks

When SwiftRawDisks is set, try to mount the disks using uuids instead of
paths. This makes mounts more stable, eg. if a kernel gets updates and
device orders are changed.

This patch will also update existing entries in /etc/fstab and replaces
the device path with the corresponding UUID.

Change-Id: I275b962447015e804638ccf85c63a22d1bb6e3d6
(cherry picked from commit 6206d19592)

deployment/swift/swift-storage-container-puppet.yaml

@@ -633,10 +633,16 @@ outputs:
             opts: -f -i size=1024
           with_items: "{{ swift_raw_disks }}"
           when: swift_raw_disks
+        - name: Refresh facts if SwiftRawDisks is set to get uuids if newly created partitions
+          setup:
+            gather_subset:
+              - '!all'
+              - 'hardware'
+          when: swift_raw_disks
         - name: Mount devices defined in SwiftRawDisks
           mount:
             name: /srv/node/{{ item }}
-            src: "{{ swift_raw_disks[item]['base_dir']|default('/dev') }}/{{ item }}"
+            src: "{% if lsblk.results['uuids'][item] is defined %}UUID={{ ansible_device_links['uuids'][item][0] }}{% else %}{{ swift_raw_disks[item]['base_dir']|default('/dev') }}/{{ item }}{% endif %}"
             fstype: xfs
             opts: noatime
             state: mounted

releasenotes/notes/swift-mount-by-uuid-7744fe7696db4b85.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    When SwiftRawDisks is set, try to mount the disks using uuids instead of
+    paths. This makes mounts more stable, eg. if a kernel gets updates and
+    device orders are changed.