help: Restart NTP service

run:
      if cli-shell-api existsActive system ntp server; then
          echo "Restarting NTP server..."
          sudo /usr/sbin/invoke-rc.d ntp force-reload
          if [[ $? -eq 0 ]]; then
              echo "Success!"
          fi
      else
          echo "NTP server is not configured"
      fi
