MongoDB URI is incorrectly formatted in css-tmp.conf

[mwright-pivotal]

Template needs to be updated to conform to new connect string schemes, either mongodb:// or mongodb+srv://. Otherwise css-api container fails to connect to mongodb

MongoAddressCsv mongo:${MONGO_PORT}

goes to

MongoAddressCsv mongodb://mongo:${MONGO_PORT}

or

MongoAddressCsv mongodb+srv://mongo:${MONGO_PORT}