Fluentd actually parse all files in /var/log/kolla/*/*.log as Openstack
services files.
Dnsmasq file /var/log/kolla/neutron/dnsmasq.log, must be add to
exclude_path to avoid this warning message:
"/var/log/kolla/neutron/dnsmasq.log unreadable. It is excluded and would
be examined next time."

Change-Id: I8dc5320b9ed299200c4f1e6ee52d34a918e2f110
Closes-Bug: #1678530