[sfpshow] Add dom_capability to transceiver eeprom

[kuanyu99]

- What I did
Show the dom_capability of the transceiver when user asking the EEPROM data.
Decode EEPROM data as UTF-8 preventing character be parsed as ASCII.

- How I did it
Add a additional qsfp_data_map item to get dom_capability from db.

- How to verify it
Run 'show interfaces transceiver eeprom' command.

- Previous command output (if the output of a command-line utility has changed)

Ethernet31: SFP EEPROM detected
        Connector: Unknown
        Encoding: Unknown
        Extended Identifier: Unknown
        Extended RateSelect Compliance: Unknown
        Identifier: Unknown
        LengthOM3(UnitsOf10m): 75
        Nominal Bit Rate(100Mbs): 75
        Specification compliance:
                10GEthernetComplianceCode: 10G Base-LR
                ESCONComplianceCodes: ESCON MMF, 1310nm LED
                EthernetComplianceCodes: 1000BASE-CX
                FibreChannelLinkLength: Intermediate distance (I)
                FibreChannelSpeed: 100 MBytes/sec
                FibreChannelTechnology: Longwave Laser (LC)
                FibreChannelTransmissionMedia: Multimode, 62.5um (M6)
                InfinibandComplianceCode: 1X Copper Passive
                SFP+CableTechnology: Active Cable
                SONETComplianceCodes: OC-12, single mode, inter reach
        Vendor Date Code(YYYY-MM-DD Lot): 2004-02-02 00
        Vendor Name: KKKKON
        Vendor OUI: 00-00-00
        Vendor PN: SFP-LP2▒0
        Vendor Rev: R01
        Vendor SN: 0000040600000036

- New command output (if the output of a command-line utility has changed)

Ethernet31: SFP EEPROM detected
        Connector: Unknown
        DOM Capability:
                sff8472_dom_support: no
        Encoding: Unknown
        Extended Identifier: Unknown
        Extended RateSelect Compliance: Unknown
        Identifier: Unknown
        LengthOM3(UnitsOf10m): 75
        Nominal Bit Rate(100Mbs): 75
        Specification compliance:
                10GEthernetComplianceCode: 10G Base-LR
                ESCONComplianceCodes: ESCON MMF, 1310nm LED
                EthernetComplianceCodes: 1000BASE-CX
                FibreChannelLinkLength: Intermediate distance (I)
                FibreChannelSpeed: 100 MBytes/sec
                FibreChannelTechnology: Longwave Laser (LC)
                FibreChannelTransmissionMedia: Multimode, 62.5um (M6)
                InfinibandComplianceCode: 1X Copper Passive
                SFP+CableTechnology: Active Cable
                SONETComplianceCodes: OC-12, single mode, inter reach
        Vendor Date Code(YYYY-MM-DD Lot): 2004-02-02 00
        Vendor Name: KKKKON
        Vendor OUI: 00-00-00
        Vendor PN: SFP-LP2▒0
        Vendor Rev: R01
        Vendor SN: 0000040600000036

[kuanyu99]

Retest this please

[lguohan]

can you resolve conflict?

[keboliu]

do we really need this to be added to the show result explicitly? I mean we can tell from the show result, if the DOM related filled are filled with 'N/A' or '0' values means it not supported.

[kuanyu99]

Imaging that, if you are trying to get the DOM sensor value of your SFP transceiver, you get all N/A or 0.
You may start to wonder if the transceiver broken or it just doesn't support DOM sensor feature.
With this, you can make sure the N/A or 0 result is correct if the SFP transceiver show "sff8472_dom_support: no".