Refresh Swift ring files without restarting containers

Updating rings consists of multiple steps today:
1. Apply puppet in the swift_ringbuilder container
2. Copying files in step 3 using swift_copy_rings
3. Run kolla_set_config to copy files to /etc/swift before starting
   Swift service processes

This needs a container restart today, because kolla_set_config will be
executed only on container (re-)starts.

This patch will execute kolla_set_configs at the step 5 of deployment,
and apply all ring changes, if any, for the Swift processes without
a container restart. Swift processes will notice the changed ring files
within 15 seconds and will use the updated rings.

Co-authored-by: Bogdan Dobrelya <bdobreli@redhat.com>
Change-Id: Ibdd783b484a84c0fdfaac84d892a8ea46be85fde

deployment/swift/releasenotes/notes/swift-refresh-rings-cc327f998490b0df.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Refresh Swift ring files without restarting containers. This makes it
+    possible to update rings without service restarts, lowering the overhead
+    for updates.

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

@@ -475,6 +475,16 @@ outputs:
                 - swift_rsyslog_config is defined
                 - swift_rsyslog_config.status is defined
                 - swift_rsyslog_config.status.ActiveState == 'active'
+        - name: Run kolla_set_configs to copy ring files
+          when: step|int == 5
+          shell: "{{ container_cli }} exec -u root {{ item }} /usr/local/bin/kolla_set_configs "
+          become: true
+          register: kolla_set_configs_result
+          failed_when:
+            - kolla_set_configs_result.rc is defined  # do not fail in dry run mode
+            - kolla_set_configs_result.rc not in [0, 125]  # ignore containers that are not running
+          with_items:
+            - swift_proxy
       update_tasks:
         - name: Check swift containers log folder/symlink exists
           stat:

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

@@ -658,6 +658,28 @@ outputs:
                 - swift_rsyslog_config is defined
                 - swift_rsyslog_config.status is defined
                 - swift_rsyslog_config.status.ActiveState == 'active'
+        - name: Run kolla_set_configs to copy ring files
+          when: step|int == 5
+          shell: "{{ container_cli }} exec -u root {{ item }} /usr/local/bin/kolla_set_configs"
+          become: true
+          register: kolla_set_configs_result
+          failed_when:
+            - kolla_set_configs_result.rc is defined  # do not fail in dry run mode
+            - kolla_set_configs_result.rc not in [0, 125]  # ignore containers that are not running
+          with_items:
+            - swift_account_auditor
+            - swift_account_reaper
+            - swift_account_replicator
+            - swift_account_server
+            - swift_container_auditor
+            - swift_container_replicator
+            - swift_container_server
+            - swift_container_updater
+            - swift_object_auditor
+            - swift_object_expirer
+            - swift_object_replicator
+            - swift_object_server
+            - swift_object_updater
       update_tasks:
         - name: Check swift containers log folder/symlink exists
           stat: