Add [taskflow] section for masakari.conf.j2

Closes-bug: 1966536
Change-Id: I66a0189511e4c937299442207459cf72165649dd

ansible/roles/masakari/templates/masakari.conf.j2

@@ -63,3 +63,6 @@ enable_proxy_headers_parsing = True
 [oslo_policy]
 policy_file = {{ masakari_policy_file }}
 {% endif %}
+
+[taskflow]
+connection = mysql+pymysql://{{ masakari_database_user }}:{{ masakari_database_password }}@{{ masakari_database_address }}/{{ masakari_database_name }}

releasenotes/notes/fix-masakari-conf-missing-taskflow-section-31b6654e29bec35d.yaml

+---
+fixes:
+  - |
+    fix missing [taskflow] section in masakari.conf.j2
+    `LP#1966536 <https://bugs.launchpad.net/kolla-ansible/+bug/1966536>`__