configure mobile-gateway pdn command hierarchy

    configure
      — mobile-gateway
          — pdn
              — apn
                  — address-assignment-defaults
                      — local-dynamic
                          — ipv4-pool
                          — ipv6-na-pool
                          — ipv6-pd-pool
                          — ipv6-slaac-pool
                      — unmanaged
                          — ipv4-pool
                          — ipv6-na-pool
                          — ipv6-pd-pool
                          — ipv6-slaac-pool
                  — aggr-rate-dl
                  — aggr-rate-ul
                  — description
                  — dhcp-profile
                  — dhcpv4-server-ip
                  — dhcpv6-profile
                  — dhcpv6-server-duid
                  — fixed-wireless-access
                      — authentication-flow
                          — adb
                      — default-ipv4-signaling-method
                      — shutdown
                  — guard-timer
                  — max-pdn-connections
                  — max-session-attach
                  — network-realm
                  — pdn-type
                  — pdn-type-conversion
                  — pdn-type-preferred-ipv6
                  — shutdown
              — bng
                  — radius-coa
                      — ignore-unknown-attributes
                      — interface
                      — python-policy
                      — secret
                  — up-group
                      — c-tag-range
                      — description
                      — fsg-profile
                      — l2-access-id
                      — s-tag-range
                      — shutdown
                      — up
                          — c-tag-range
                          — drain
                          — l2-access-id
                          — preferred
                          — s-tag-range
                  — wpp
                      — interface
              — cdbx
                  — cloud-db-profile
                  — interface
                  — mss
              — epc-node
              — instance-type
              — local-address-assignment
                  — network-realm
                      — description
                      — pool
                          — dedicated
                          — description
                          — hold-time
                          — ipv4
                              — default-gateway
                              — dns
                                  — primary-dns
                                  — secondary-dns
                              — micro-net-length
                              — prefix
                                  — drain
                                  — exclude-addresses
                              — subnet-allocation
                                  — length
                                  — variable
                          — ipv6
                              — dns
                                  — primary-dns
                                  — secondary-dns
                              — na
                                  — micro-net-length
                                  — prefix
                                      — drain
                                      — exclude-addresses
                              — pd
                                  — delegated-prefix
                                      — length
                                      — variable
                                  — micro-net
                                  — prefix
                                      — drain
                                      — exclude-prefixes
                              — slaac
                                  — micro-net-length
                                  — prefix
                                      — drain
                                      — exclude-prefixes
                          — minimum-free
              — pfcp-node-id-type
              — s11
                  — interface
                      — gtp-c
                  — signaling
                      — gtp-c
                          — ddn-damp-timer
                          — ddn-extended-buffering-time
                          — ddn-throttling-arp-threshold
                          — ue-inactivity-timer
              — s5
                  — interface
                      — gtp-c
              — shutdown
                  — gtp-c
                      — profile
              — sx-n4
                  — enforced-pfcp-association-list
                  — interface
                      — ibcp
                      — pfcp
                  — pfcp-association-list
                  — signaling
                      — ibcp
                          — bng-entry-point
                          — ip-dscp
                          — ip-ttl
                          — triggers
                      — pfcp
                          — profile