Add back nodeId to config def
Add a default value because the model    does not produce the
value anymore.
This should not be necessary. The field can safely be removed
because the config model of older versions always adds a value
for this field.
# Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package=ai.vespa.metricsproxy.http.application
+# TODO: remove, unused
+node[].nodeId string default=""
+
node[].hostname string
node[].role string
node[].metricsPort int
