Do not start swift-object-updater on stop

Change-Id: I7970c5b02f178fd8fb35c984117f6bc848353a5b
Closes-Bug: #1906944
(cherry picked from commit 74ae14a)

Author: yoctozepto

ansible/roles/swift/tasks/stop.yml

@@ -123,7 +123,7 @@
 - name: Stopping swift-object-updater container
   become: true
   kolla_docker:
-    action: "start_container"
+    action: "stop_container"
     common_options: "{{ docker_common_options }}"
     name: "swift_object_updater"
   when:

releasenotes/notes/bug-1906944-38798e1348ff9c97.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes Swift's stop action. It will no longer try to start
+    ``swift-object-updater`` container again.
+    `LP#1906944 <https://launchpad.net/bugs/1906944>`__