Sync rings to all swift hosts to build_files

In previous patch [1] I wrongly assumed that there's no reason to have
/etc/swift/ring_build_files/
on all hosts. However, there's another logic in the role, that assumes
having these files and verifying md5sum of them.

As an easy bugfix, we're returning sync to ring_build_files until we
change logic. It's also easily backportable.

[1] https://review.opendev.org/c/openstack/openstack-ansible-os_swift/+/765354

Change-Id: If0e686352e08379027508c2939fae00db6ae6cb8
Closes-Bug: #1973045

tasks/swift_rings_distribute.yml

@@ -23,5 +23,8 @@
 - name: Upload swift rings
   synchronize:
     src: "{{ lookup('env', 'OSA_CONFIG_DIR') }}/ring_build_files/"
-    dest: /etc/swift/
+    dest: "{{ item }}"
     mode: push
+  with_items:
+    - /etc/swift/
+    - /etc/swift/ring_build_files/