Fix parsing of infra.mariadb.xinetd logs

Currently the logs tagged with infra.mariadb.xinetd flow into
elasticsearch with no hostname or programname attach, thus making
navigating the logs very hard.

The quick fix is renaming the tag to infra.mariadb-xinetd, which is just
enought to ensure the logs are processed correctly with the existing
filters.

TrivialFix

Change-Id: Icd72206de7c1f701bdf35c8fb3b128ef2dbe29a8
(cherry picked from commit 7f1248f)

Author: JohnGarbutt

ansible/roles/common/templates/conf/input/02-mariadb.conf.j2

@@ -14,7 +14,7 @@
   @type tail
   path /var/log/kolla/mariadb/xinetd.log
   pos_file /var/run/{{ fluentd_binary }}/mariadb-xinetd.pos
-  tag infra.mariadb.xinetd
+  tag infra.mariadb-xinetd
   format multiline
   format_firstline /^\d{2}/\d{1,2}/\d{1,2}@\d{1,2}:\d{1,2}:\d{1,2}\: (START|EXIT)\: /
   format1 /^(?<Timestamp>\S+) (?<Payload>.*)?$/