docker: adds mysqldb with test data

Downloads a large open dataset from NYC Open Data.
Then converts date columns into the mysql format.

docker/blocks/mysql_opendata/Dockerfile

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+## MySQL with Open Data Set from NYC Open Data (https://data.cityofnewyork.us)
+
+FROM mysql:latest
+
+ENV MYSQL_DATABASE="testdata" \
+    MYSQL_ROOT_PASSWORD="rootpass" \
+    MYSQL_USER="grafana" \
+    MYSQL_PASSWORD="password"
+
+# Install requirement (wget)
+RUN apt-get update && apt-get install -y wget && apt-get install unzip
+
+# Fetch NYC Data Set
+RUN wget https://data.cityofnewyork.us/download/fpz8-jqf4/application%2Fzip -O /tmp/data.zip && \
+  unzip -j /tmp/data.zip 311_Service_Requests_from_2011.csv -d /var/lib/mysql-files
+
+ADD import_csv.sql /docker-entrypoint-initdb.d/
+
+EXPOSE 3306