configure mobile-gateway profile pfcp command hierarchy

    configure
      — mobile-gateway
          — profile
              — pfcp
                  — pfcp-association-peer-list
                      — description
                      — node-id
                          — bfd-enable
                      — pfcp-peer
                          — bfd-enable
                  — pfcp-profile
                      — association-retry-timer
                      — audit-ip-dscp
                      — description
                      — heart-beat
                      — ip-dscp
                      — ip-ttl
                      — message-retransmit
                      — path-restoration-time
                  — up-peer-list
                      — description
                      — peer
                          — apn
                          — upf-selection