Trivial: Add connection: local for keystone-fernet cron generate task

This patch add connection local for above mentioned task as
kolla-ansible can be executed in docker container as in
my case.

When there is no connection: local, ansible is trying to connect
to localhost via ssh where specified python script is not available.

After connection: local everything is working as expected as file
is found inside container

Closes-Bug: #2004224

Change-Id: I219a958b4f101efb71a2935e6d910dae5c65f0be

ansible/roles/keystone/tasks/config.yml

@@ -200,6 +200,7 @@
     -n {{ (groups['keystone'] | length) }}
   changed_when: false
   register: cron_jobs_json
+  connection: local
   delegate_to: localhost
 
 - name: Set fact with the generated cron jobs for building the crontab later

releasenotes/notes/bug-2004224-0e600c99f8e5b83f.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes keystone's task which is connecting via ssh instead
+    locally.
+    `LP#2004224 <https://launchpad.net/bugs/2004224>`__