configure mobile-gateway profile gtp command hierarchy

    configure
      — mobile-gateway
          — profile
              — gtp
                  — description
                  — gtpv2-session-rejection-cause
                      — apn-shutdown
                      — gw-suspend
                      — sx-connection-failure
                  — ip-dscp
                  — ip-ttl
                  — keep-alive
                  — message-retransmit