The value of tRPOperPSDefActionAigpMetric indicates the editing
action to be taken for the AIGP (Accumulated IGP) attribute when
the route satisfies the match criteria of the policy.
When the value of tRPOperPSDefActionAigpMetric is set to 'none(1)'
or 'useIgp(4)', the value of tRPOperPSDefActnAigpMetricVal is
ignored.