dcs-rs-deploy: make dcs-web listen on the private IP address

This is necessary so that the monitoring can access dcs-web’s /varz
endpoint from within the Rackspace data center.
dcs-rs-deploy: update int-dcs-web DNS record for monitoring
gofmt dcs-rs-deploy
add varz-to-influxdb for monitoring

This is a small program running on our monitoring VM which will
periodically scrape the /varz endpoints of e.g. dcs-web and insert
timeseries into InfluxDB.