@Override
    public boolean equals(Object o) {
        if (o == this) return true;
        if ( ! (o instanceof ConfigDefinitionKey)) return false;

        ConfigDefinitionKey other = (ConfigDefinitionKey)o;
        return name.equals(other.getName()) && namespace.equals(other.getNamespace());
    }
Creates a config definition key.

@param name      config definition name
@param namespace config definition namespace
config/src/main/java/com/yahoo/vespa/config/ConfigDefinitionKey.java