add attribute priority to managed-nfprofile to aligne with stateg2

      uses nfs3gpp:PlmnSnssai;

    }

    leaf priority {

      description "Priority (relative weight) of the NF instance, in the

       range of 0-65535, compared to other NF instances of the same type,

       to be used for NF selection; if capacity is also present in the

       nfServiceList parameters, those will have precedence over this value.";

      type uint16;

    }

    list allowedSNPNs {

      description "SNPNs allowed to access the NF instance.

      The absence of this attribute in the NF profile indicates that no SNPN,