The ReST end point /foreignSourcesConfig/assets contains invalid fields

The end point in question is used to retrieve all the available fields of the OnmsAssetRecord entity. It does a simple class introspection to obtain all the getters.

The problem is that it is including fields that are not supposed to be overridable like:

• id
• class
• geolocation
• node

Those fields should be blacklisted or removed from the available list of fields prior return it to the client.