GetServiceSettingsMap helper function for use by client code in NewClient instances This function takes the schema.ResourceData passed in to NewClient, gets the *schema.Set at the key passed in, converts to a list which we know will have just one element, gets that element and converts to map[string]interface{}.

Initialisation interface, service Client creation code will have to satisfy this interface The hpegl provider will iterate over a slice of these to initialise service clients.