pbr: fix nexthop-group json output

[chiragshah6]

• JSON format is changed. currently json output returns as array format, in which we cannot add extra attributes under it. so, we modified the JSON format into dict.
• Added nhgCount into vtysh "show pbr nexthop-groups json".
• Addressed interface-name & vrf-id issues. currently, "vrfId" is mapped with interface name.

supported commands:

show pbr nexthop-groups json
show pbr nexthop-groups <nh-grp> json

Testing:

Before fix:

leaf12# show pbr nexthop-groups json
[
  {
    "id":10001,
    "name":"nh-grp-2",
    "valid":true,
    "installed":false,
    "nexthops":[
      {
        "nexthop":"12.10.10.1",
        "vrfId":"swp1", ====> wrongly mapped
        "valid":true
      }
    ]
  },
  {
    "id":10000,
    "name":"nh-grp-1",
    "valid":false,
    "installed":false,
    "nexthops":[
      {
        "nexthop":"11.10.10.1",
        "vrfId":"lo", ====> wrongly mapped
        "valid":false
      }
    ]
  }
]

After fix:

leaf11# show pbr nexthop-groups nh-grp-1 json
{
  "10000":{
    "id":10000,
    "name":"nh-grp-1",
    "valid":false,
    "installed":false,
    "nexthops":[
      {
        "nexthop":"11.10.10.1",
        "valid":false
      },
      {
        "nexthop":"2.2.2.1",
        "interfaceName":"swp1",
        "vrfId":0,
        "valid":false
      }
    ]
  },
  "nhgCount":1
}

Signed-off-by: Sindhu Parvathi Gopinathan's [email protected]