Fix Fluentd warn on dnsmasq.log file parsing

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

ansible/roles/common/templates/conf/input/00-global.conf.j2

 <source>
   @type tail
   path /var/log/kolla/*/*.log
-  exclude_path ["/var/log/kolla/rabbitmq/*.log", "/var/log/kolla/mariadb/mariadb.log", "/var/log/kolla/haproxy/*.log", "/var/log/kolla/swift/*.log"]
+  exclude_path ["/var/log/kolla/rabbitmq/*.log", "/var/log/kolla/mariadb/mariadb.log", "/var/log/kolla/haproxy/*.log", "/var/log/kolla/swift/*.log", "/var/log/kolla/neutron/dnsmasq.log"]
   pos_file /var/run/td-agent/kolla.pos
   tag kolla.*
   format /^(?<message>.*)$/