Registrar Removes Units

[jhughesbiot]

Creating a metadata.json config file for a device that includes units is removed by the registrar tool from the generated_config.json that is pushed to the config block of the device in GCP. Since units are a valid property in the point schema, these should be left in.

https://github.com/grafnu/udmi/blob/master/schema/config_pointset_point.json#L12