The value of the sapEgressHsmdaWrrPolicyOvr specifies the
egress hsmda weighted round-robin policy override for this
SAP. When no policy is given, the hsmda weighted
round-robin policy specified in the sap-egress policy is
honored. When a valid policy is given, it is used instead
of the hsmda weighted round-robin policy given in the
sap-egress policy.