[docker-database] Add missing '%' in '%syslogtag%' (#2434)

Author: jleveque

dockers/docker-database/Dockerfile.j2

@@ -1,7 +1,7 @@
 FROM docker-config-engine
 
 ARG docker_container_name
-RUN [ -f /etc/rsyslog.conf ] && sed -ri "s/%syslogtag%/$docker_container_name#syslogtag%/;" /etc/rsyslog.conf
+RUN [ -f /etc/rsyslog.conf ] && sed -ri "s/%syslogtag%/$docker_container_name#%syslogtag%/;" /etc/rsyslog.conf
 
 # Make apt-get non-interactive
 ENV DEBIAN_FRONTEND=noninteractive