Add host_prep_task to setup proper logging for Swift

Recent overcloud images seem to be more lightweight, and the
openstack-swift-*.rpms are no longer installed. However, these rpms
created an entry in /etc/rsyslog.d/openstack-swift.conf, which ensures
that Swift logs are actually written to /var/log/swift/swift.log

This file is now missing, and thus logs mess up /var/log/messages.

Closes-Bug: 1776180
Change-Id: Icf4310558e3cceafbdd67f72432e59730b96a588

docker/services/swift-proxy.yaml

@@ -253,6 +253,18 @@ outputs:
             src: /var/log/swift
             dest: /var/log/containers/swift
             state: link
+        - name: Forward logging to swift.log file
+          copy:
+            content: |
+              # Fix for https://bugs.launchpad.net/tripleo/+bug/1776180
+              local2.*                 /var/log/swift/swift.log
+              &                        stop
+            dest: /etc/rsyslog.d/openstack-swift.conf
+          register: logconfig
+        - name: Restart rsyslogd service after logging conf change
+          service: name=rsyslog state=restarted
+          when:
+            - logconfig|changed
       upgrade_tasks:
         - name: Check if swift-proxy or swift-object-expirer are deployed
           command: systemctl is-enabled --quiet "{{ item }}"

docker/services/swift-storage.yaml

@@ -459,6 +459,18 @@ outputs:
               Log files from swift containers can be found under
               /var/log/containers/swift and /var/log/containers/httpd/swift-*.
           ignore_errors: true
+        - name: Forward logging to swift.log file
+          copy:
+            content: |
+              # Fix for https://bugs.launchpad.net/tripleo/+bug/1776180
+              local2.*                 /var/log/swift/swift.log
+              &                        stop
+            dest: /etc/rsyslog.d/openstack-swift.conf
+          register: logconfig_changed
+        - name: Restart rsyslogd service after logging conf change
+          service: name=rsyslog state=restarted
+          when:
+            - logconfig|changed
         - name: Format SwiftRawDisks
           filesystem:
             fstype: xfs