Fix bug to use `ip` instead of the non-existant `host` config value
Fix bug to use `ip` instead of the non-existant `host` config value

- the `host` config value does not exist in the config schema
- the `ip` config param exists and is the right one to use

mozilla-services/msisdn-gateway,mozilla-services/msisdn-gateway,mozilla-services/msisdn-gateway