Fix CI system to work on both Python 2 and 3 (#225)

* Use old style middleware settings for Python 2.

* Make entrypoint python2 and 3 compatible.

* Fix python command to test for mysql server.

* Bettery docker-entrypoint to work with Python 2 & 3

* Add missing braces.

web/docker-entrypoint.sh

@@ -16,7 +16,15 @@ function wait_for_postgres () {
 
 function wait_for_mysql () {
 	# Check if MySQL is up and accepting connections.
-	HOSTNAME=$(python -c "from urllib.parse import urlparse; o = urlparse('$DATABASE_URL'); print(o.hostname);")
+	HOSTNAME=$(python <<EOF
+try:
+    from urllib.parse import urlparse
+except ImportError:
+    from urlparse import urlparse
+o = urlparse('$DATABASE_URL')
+print(o.hostname)
+EOF
+)
 	until mysqladmin ping --host "$HOSTNAME" --silent; do
 		>&2 echo "MySQL is unavailable - sleeping"
 		sleep 1