[db_migrator] Migrate tunnel table

[lolyu]

What I did

Currently, the IPinIP tunnel and decap terms are removed after warm-reboot to 202405:

2025 Jan  6 12:29:59.356200 WARNING syncd#syncd: :- logViewObjectCount: object count for SAI_OBJECT_TYPE_TUNNEL on current view 3 is different than on temporary view: 1
2025 Jan  6 12:29:59.356200 WARNING syncd#syncd: :- logViewObjectCount: object count for SAI_OBJECT_TYPE_TUNNEL_TERM_TABLE_ENTRY on current view 13 is different than on temporary view: 1

Starting from 202405, the decap terms are removed out of TUNNEL_DECAP_TABLE, and TUNNEL_DECAP_TERM_TABLE is used to describe the decap terms.
Let's migrate the TUNNEL_DECAP_TABLE based on the db schema change introduced in 202405.

Signed-off-by: Longxiang Lyu [email protected]

How I did it

• before migration:

{
    "TUNNEL_DECAP_TABLE:IPINIP_TUNNEL": {
        "dscp_mode": "uniform",
        "dst_ip": "10.0.0.56,10.0.0.58,10.0.0.60,10.0.0.62,10.1.0.32,192.168.0.1",
        "ecn_mode": "copy_from_outer",
        "ttl_mode": "pipe",
        "tunnel_type": "IPINIP"
    }
}

• after migration:

{
    "TUNNEL_DECAP_TABLE:IPINIP_TUNNEL": {
        "dscp_mode": "uniform",
        "ecn_mode": "copy_from_outer",
        "ttl_mode": "pipe",
        "tunnel_type": "IPINIP"
    },
    "TUNNEL_DECAP_TERM_TABLE:IPINIP_TUNNEL:10.0.0.56": {
        "term_type": "P2MP"
    },
    "TUNNEL_DECAP_TERM_TABLE:IPINIP_TUNNEL:10.0.0.58": {
        "term_type": "P2MP"
    },
    "TUNNEL_DECAP_TERM_TABLE:IPINIP_TUNNEL:10.0.0.60": {
        "term_type": "P2MP"
    },
    "TUNNEL_DECAP_TERM_TABLE:IPINIP_TUNNEL:10.0.0.62": {
        "term_type": "P2MP"
    },
    "TUNNEL_DECAP_TERM_TABLE:IPINIP_TUNNEL:10.1.0.32": {
        "term_type": "P2MP"
    },
    "TUNNEL_DECAP_TERM_TABLE:IPINIP_TUNNEL:192.168.0.1": {
        "term_type": "P2MP"
    }
}

How to verify it

1. UT
2. warm reboot from 202311 to 202405.

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

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

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[lolyu]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[bingwang-ms]

LGTM. @vaibhavhd Could you please help review?