[TRAIN-ONLY] Ensure we clean old ansible logs in mistral

While we do rotate the ansible.log file, it's never cleaned. This can
lead to some issues, depending on the amount of day-2 operations
(scaling, update, etc) - increasing size without control is usually a
bad thing.

Notes:
- we're using `find' instead of tmpwatch, because we want to target
  precise file pattern to remove. tmpwatch does the exact contrary.
- we're pushing the `find' in the existing container log cleaning, so
  that we don't have to edit newer releases to remove any new script we
  may want to add
- mistral being removed in newer releases (stable/wallaby), we can
  safely make this "train-only", and let newer releases override that
  script so that we don't have dangling things

Resolves: rhbz#2144483
Change-Id: Ifbd990f15b9d85260ab20a2004fe79bafda929d9

deployment/logrotate/logrotate-crond-container-puppet.yaml

@@ -109,6 +109,8 @@ outputs:
           when: step|int == 2
           block:
             - name: Push script
+              vars:
+                 LogrotatePurgeAfterDays: {get_param: LogrotatePurgeAfterDays}
               copy:
                 dest: /usr/local/sbin/containers-tmpwatch
                 owner: root
@@ -122,9 +124,11 @@ outputs:
                     -X "/var/log/containers/*/*err" \
                     {{ LogrotatePurgeAfterDays|int +1 }}d \
                     /var/log/containers/ 2>&1 | logger -t container-tmpwatch
-              vars:
-                 LogrotatePurgeAfterDays: {get_param: LogrotatePurgeAfterDays}
-            - name: Insert cronjob in root crontab
+                  find /var/lib/mistral -type f \
+                    -iname '*.log-*' \
+                    -atime +{{ LogrotatePurgeAfterDays|int +1 }} \
+                    -print -delete >&1 | logger -t mistral-log-clean
+            - name: Insert cronjob in root crontab for containers logs
               cron:
                 name: "Remove old logs"
                 special_time: "daily"