fix mariadb Dockerfile

- fix base image
- expose ports
- new mariadb packages log to /var/log/mariadb

Change-Id: I60adc956c82c352f91f718a3a2d5a4a86dd00293

docker/mariadb/Dockerfile

-FROM fedora
+FROM kollaglue/fedora-rdo-base
 MAINTAINER Lars Kellogg-Stedman <lars@redhat.com>
 
 RUN yum -y install mariadb-galera-server
 ADD /entrypoint.sh /entrypoint.sh
 
 VOLUME /var/lib/mysql
-VOLUME /var/log/mysql
+VOLUME /var/log/mariadb
+
+EXPOSE 3306
 
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["mysqld_safe"]