Remove test variable for service_name in panko.conf file

panko.conf depends on "service_name" variable, but when generating
panko.conf in ceilometer, this variable is not set.

Panko is a single process service, no need add such test. So simple
remove the if clause.

Change-Id: I5ba41046e35cd3fa00b8c22e1b4435acfaff5279
Closes-Bug: #1725159

ansible/roles/panko/tasks/config.yml

@@ -22,8 +22,6 @@
     - Restart panko-api container
 
 - name: Copying over panko.conf
-  vars:
-    service_name: "{{ item.key }}"
   merge_configs:
     sources:
       - "{{ role_path }}/templates/panko.conf.j2"

ansible/roles/panko/templates/panko.conf.j2

@@ -3,10 +3,8 @@
 log_dir = /var/log/kolla/panko
 debug = {{ panko_logging_debug }}
 
-{% if service_name == 'panko-api' %}
 # Force panko-api.log or will use app.wsgi
 log_file = /var/log/kolla/panko/panko-api.log
-{% endif %}
 
 
 [database]