[Bug]: Multi-asic support for test_gnmi_configdb TCs

[agadia-cisco]

Issue Description

For Multi-Asic devices, test_gnmi_configdb_full_01 TC fails because sonic-cfggen -d --print-data isn't picking the right config_db; by default its picking the config_db.json instead of asic specific config_db due to which the values of PORT key and show interface status are not in sync.

Therefore right config_db has to be picked which has the PORT keys which are being used in the TC.

Results you see

    "PORT": {
        "Eth0/0/0/0": {
            "admin_status": "up",
            "description": "ASIC0:Eth0-ASIC0",
            "lanes": "0",
            "mtu": "9100",
            "pfc_asym": "off",
            "speed": "400000",
            "tpid": "0x8100"
        },
        "Eth0/0/0/1": {
            "admin_status": "up",
            "description": "ASIC0:Eth8-ASIC0",
            "lanes": "0",
            "mtu": "9100",
            "pfc_asym": "off",
            "speed": "400000",
            "tpid": "0x8100"
        },
....
....
....

Results you expected to see

    "PORT": {
        "Ethernet0": {
            "admin_status": "up",
            "alias": "Eth0/0/0/0",
            "asic_port_name": "Eth0-ASIC0",
            "description": "ARISTA01T3:Ethernet1",
            "fec": "rs",
            "index": "0",
            "lanes": "1288,1289,1290,1291",
            "mtu": "9100",
            "pfc_asym": "off",
            "role": "Ext",
            "speed": "100000",
            "tpid": "0x8100"
        },
        "Ethernet8": {
            "admin_status": "up",
            "alias": "Eth0/0/0/1",
            "asic_port_name": "Eth8-ASIC0",
            "description": "ARISTA01T3:Ethernet2",
            "fec": "rs",
            "index": "1",
            "lanes": "1280,1281,1282,1283",
            "mtu": "9100",
            "pfc_asym": "off",
            "role": "Ext",
            "speed": "100000",
            "tpid": "0x8100"
        },
 ....
....
....

Is it platform specific

generic

Relevant log output

No response

Output of show version

No response

Attach files (if any)

No response

[agadia-cisco]

I am picking this issue & will raise a PR for it soon.

cc - @vperumal

[vperumal]

FYI @abdosi @yejianquan . @agadia-cisco is going to fix the issue and upstream the PR

[yejianquan]

@xincunli-sonic for viz

[agadia-cisco]

SET TCs fails because Multi-Asic Support is needed for ApplyPatchDb API.
Issue - sonic-net/sonic-gnmi#329