Fix conditional for rsyslog_client_all_log_files
Fix conditional for rsyslog_client_all_log_files

When log_files isn't defined the "rsyslog_client_all_log_files" will
error out, so we conditionally create this depending on whether
log_files will have been created or not.

Change-Id: I51b16c234c0ddc88751b2e8af6c62688a3a518f0

openstack/openstack-ansible-rsyslog_client,openstack/openstack-ansible-rsyslog_client