Fix template reference for ganesha.conf

We can simply reference the template name since it exists within the
role that we are calling. We don't need to check the ANSIBLE_ROLE_PATH
or playbooks directory for the file.

roles/ceph-nfs/tasks/start_nfs.yml

@@ -25,7 +25,7 @@
 - name: generate ganesha configuration file
   action: config_template
   args:
-    src: "{{ lookup('env', 'ANSIBLE_ROLES_PATH') | default (playbook_dir + '/roles', true) }}/ceph-nfs/templates/ganesha.conf.j2"
+    src: "ganesha.conf.j2"
     dest: /etc/ganesha/ganesha.conf
     owner: "root"
     group: "root"