bgpd: EVPN fix per rd specific type-2 json output

bgpd: EVPN fix per rd specific type-2 json output

Current Issue:

paths key is not there for
'show bgp l2vpn evpn route rd <rd-id> mac <mac> json' uses
evpn prefix as key for each path.
Replace the evpn prefix with "paths".
This aligned with overall EVPN RIB json output like
'show bgp l2vpn evpn route json'
'show bgp l2vpn evpn route rd <> type 2 json'

Fix:

paths key is added instead of prefix info.

Ticket:#4087461

Issue:4087461

Testing:

Before fix:

leaf22# show bgp l2vpn evpn route rd 6.0.0.17:2 mac 00:02:00:00:00:12 json
{
  "prefix":"[2]:[0]:[48]:[00:02:00:00:00:12]",
  "prefixLen":352,
  "rd":"6.0.0.17:2",
  "routeType":2,
  "ethTag":0,
  "macLen":48,
  "mac":"00:02:00:00:00:12",
  "advertisedTo":{
    "220.20.0.33":{
      "hostname":"spine21"
    },
    "220.21.0.33":{
      "hostname":"spine22"
    }
  },
  "[2]:[0]:[48]:[00:02:00:00:00:12]":[ <=====  Prefix info instead of "paths" key
    [
      {
        "vni":"101101",
        "aspath":{
          "string":"65202 65024",
          "segments":[
            {
              "type":"as-sequence",
              "list":[
                65202,
                65024
              ]
            }
          ],
          "length":2
        },
        "esi":"03:00:00:00:77:02:04:00:00:18",
        "es_info":{
          "localEs":true
        },
        "origin":"IGP",
        "valid":true,
        "version":5,
        "bestpath":{
          "bestpathFromAs":65202,
          "overall":true,
          "selectionReason":"Older Path"
        },
        "extendedCommunity":{
          "string":"RT:65024:101101 ET:8"
        },
        "lastUpdate":{
          "epoch":1726803218,
          "string":"Fri Sep 20 03:33:38 2024\n"
        },
        "nexthops":[
          {
            "ip":"6.0.0.17",
            "hostname":"spine21",
            "afi":"ipv4",
            "metric":0,
            "accessible":true,
            "used":true
          }
        ],
        "peer":{
          "peerId":"220.20.0.33",
          "routerId":"6.0.0.20",
          "hostname":"spine21",
          "type":"external"
        }
      }
    ],
    [
      {
        "vni":"101101",
        "aspath":{
          "string":"65202 65024",
          "segments":[
            {
              "type":"as-sequence",
              "list":[
                65202,
                65024
              ]
            }
          ],
          "length":2
        },
        "esi":"03:00:00:00:77:02:04:00:00:18",
        "es_info":{
          "localEs":true
        },
        "origin":"IGP",
        "valid":true,
        "version":5,
        "extendedCommunity":{
          "string":"RT:65024:101101 ET:8"
        },
        "lastUpdate":{
          "epoch":1726803218,
          "string":"Fri Sep 20 03:33:38 2024\n"
        },
        "nexthops":[
          {
            "ip":"6.0.0.17",
            "hostname":"spine22",
            "afi":"ipv4",
            "metric":0,
            "accessible":true,
            "used":true
          }
        ],
        "peer":{
          "peerId":"220.21.0.33",
          "routerId":"6.0.0.21",
          "hostname":"spine22",
          "type":"external"
        }
      }
    ]
  ],
  "numPaths":2
}

After fix:

eaf22# show bgp l2vpn evpn route rd 6.0.0.17:2 mac 00:02:00:00:00:12 json
{
  "prefix":"[2]:[0]:[48]:[00:02:00:00:00:12]",
  "prefixLen":352,
  "rd":"6.0.0.17:2",
  "routeType":2,
  "ethTag":0,
  "macLen":48,
  "mac":"00:02:00:00:00:12",
  "advertisedTo":{
    "220.20.0.33":{
      "hostname":"spine21"
    },
    "220.21.0.33":{
      "hostname":"spine22"
    }
  },
  "paths":[
    [
      {
        "vni":"101101",
        "aspath":{
          "string":"65202 65024",
          "segments":[
            {
              "type":"as-sequence",
              "list":[
                65202,
                65024
              ]
            }
          ],
          "length":2
        },
        "esi":"03:00:00:00:77:02:04:00:00:18",
        "es_info":{
          "localEs":true
        },
        "origin":"IGP",
        "valid":true,
        "version":3,
        "bestpath":{
          "bestpathFromAs":65202,
          "overall":true,
          "selectionReason":"Router ID"
        },
        "extendedCommunity":{
          "string":"RT:65024:101101 ET:8"
        },
        "lastUpdate":{
          "epoch":1727175046,
          "string":"Tue Sep 24 10:50:46 2024\n"
        },
        "nexthops":[
          {
            "ip":"6.0.0.17",
            "hostname":"spine21",
            "afi":"ipv4",
            "metric":0,
            "accessible":true,
            "used":true
          }
        ],
        "peer":{
          "peerId":"220.20.0.33",
          "routerId":"6.0.0.20",
          "hostname":"spine21",
          "type":"external"
        }
      }
    ],
    [
      {
        "vni":"101101",
        "aspath":{
          "string":"65202 65024",
          "segments":[
            {
              "type":"as-sequence",
              "list":[
                65202,
                65024
              ]
            }
          ],
          "length":2
        },
        "esi":"03:00:00:00:77:02:04:00:00:18",
        "es_info":{
          "localEs":true
        },
        "origin":"IGP",
        "valid":true,
        "version":3,
        "extendedCommunity":{
          "string":"RT:65024:101101 ET:8"
        },
        "lastUpdate":{
          "epoch":1727175046,
          "string":"Tue Sep 24 10:50:46 2024\n"
        },
        "nexthops":[
          {
            "ip":"6.0.0.17",
            "hostname":"spine22",
            "afi":"ipv4",
            "metric":0,
            "accessible":true,
            "used":true
          }
        ],
        "peer":{
          "peerId":"220.21.0.33",
          "routerId":"6.0.0.21",
          "hostname":"spine22",
          "type":"external"
        }
      }
    ]
  ],
  "numPaths":2
}

Signed-off-by: Sindhu Parvathi Gopinathan's <sgopinathan@nvidia.com>