S/N in H3C Model h3c.rb

[lav-fsb]

Hello!

I think need edit https://github.com/ytti/oxidized/blob/master/lib/oxidized/model/h3c.rb

cmd 'display device' do |cfg|
    comment cfg
  end

to

cmd 'display device manuinfo' do |cfg|
    comment cfg
  end

Cause in display info we get a little info, without serial number.

display device
Slot Type State Subslot Soft Ver Patch Ver
1 S5560X-54C-PWR-EI Master 0 S5560X-6813 None

display device manuinfo
Slot 1 CPU 0:
DEVICE_NAME : S5560X-54C-PWR-EI
DEVICE_SERIAL_NUMBER : 210235A1X75555N0G003
MAC_ADDRESS : 1484-77AE-A480
MANUFACTURING_DATE : 2023-04-28
VENDOR_NAME : H3C
PRODUCT ID : LS-5560X-54C-PWR-EI
Fan 1:
DEVICE_SERIAL_NUMBER : NONE
Fan 2:
DEVICE_SERIAL_NUMBER : NONE
Power 1:
DEVICE_NAME : PSR720-56A-GL
DEVICE_SERIAL_NUMBER : 210231A7GEH23B0H00SG
MANUFACTURING_DATE : 2023-11-12
VENDOR_NAME : H3C

And this sometimes helps a lot to find the right device through a configuration search.