mariadb-clustercheck: ensure /var/log/kolla/mariadb exists

If mariadb-clustercheck starts before mariadb, the directory may not
exist, and the command fails.

This is necessary for the refactored MariaDB restart in
I5a12670d07077d24047aaff57ce8d33ccf7156ff.

Change-Id: Ie1b36eb9a403611c2f86aa4c1d500d324e5291f3
(cherry picked from commit 9035251443ed6cbb110e9dc5efdbc9d4be797ef5)

docker/mariadb/mariadb-clustercheck/Dockerfile.j2

@@ -15,5 +15,9 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {% endif %}
 
+COPY extend_start.sh /usr/local/bin/kolla_extend_start
+
+RUN chmod 644 /usr/local/bin/kolla_extend_start
+
 {% block mariadb_clustercheck_footer %}{% endblock %}
 {% block footer %}{% endblock %}

docker/mariadb/mariadb-clustercheck/extend_start.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+: ${MARIADB_LOG_DIR:=/var/log/kolla/mariadb}
+
+# Create log directory, with appropriate permissions
+if [[ ! -d "${MARIADB_LOG_DIR}" ]]; then
+    mkdir -p ${MARIADB_LOG_DIR}
+fi
+if [[ $(stat -c %a ${MARIADB_LOG_DIR}) != "755" ]]; then
+    chmod 755 ${MARIADB_LOG_DIR}
+fi