tools perform command hierarchy

    tools
      — perform
          — mobile-gateway
              — pdn
                  — force-clear  
                      — bearer-context
                  — pfcp-audit
              — profile
                  — authentication-database
                      — lookup
                  — bng
                      — entry-point
                          — lookup
                      — radius
                          — coa
                              — attribute
                              — debug
                              — deliver-request
                              — destination-ip
                              — info
                              — router
                              — source-ip