feat: adding ndmp session rest template

[Hardikl]

Tested.

[Hardikl]

As the actual running NDMP session response is not available for testing, I have tested the template against the Swagger default example.

This is example response:

{
  "_links": {
    "next": {
      "href": "/api/resourcelink"
    },
    "self": {
      "href": "/api/resourcelink"
    }
  },
  "num_records": 1,
  "records": [
    {
      "_links": {
        "self": {
          "href": "/api/resourcelink"
        }
      },
      "backup_engine": "dump",
      "client_address": "string",
      "client_port": 0,
      "data": {
        "bytes_processed": 5000,
        "connection": {
          "address": "string",
          "port": 18600,
          "type": "local"
        },
        "operation": "backup",
        "reason": "aborted",
        "state": "active"
      },
      "data_path": "/vserver1/vol1",
      "id": "string",
      "mover": {
        "bytes_moved": 645120,
        "connection": {
          "address": "string",
          "port": 18600,
          "type": "local"
        },
        "mode": "read",
        "reason": "aborted",
        "state": "active"
      },
      "node": {
        "_links": {
          "self": {
            "href": "/api/resourcelink"
          }
        },
        "name": "node1",
        "uuid": "1cd8a442-86d1-11e0-ae1c-123478563412"
      },
      "scsi": {
        "device_id": "string",
        "host_adapter": 0,
        "lun_id": 0,
        "target_id": 0
      },
      "source_address": "string",
      "svm": {
        "_links": {
          "self": {
            "href": "/api/resourcelink"
          }
        },
        "name": "svm1",
        "uuid": "02c9e252-41be-11e9-81d5-00a0986138f7"
      },
      "tape_device": "nrst0a",
      "tape_mode": "read",
      "uuid": "string"
    }
  ]
}

Prometheus metrics from NDMP session: