please expose the ssh user in list-sessions

[evgeni]

When I do a duffy client list-sessions, I get my sessions and my nodes, but it doesn't tell me which user I shall use for SSH.

Looking at

duffy/duffy/nodes/context.py

Line 33 in 542b3ed

SSH_REMOTE_CONTEXTUALIZE_CMD = "cat - >> ~root/.ssh/authorized_keys"

I assume it's always root, but it would be nice if that would be part of the API reply:

      "nodes": [
        {
          "hostname": "n27-25-177.pool.ci.centos.org",
          "ipaddr": "172.27.25.177",
          "comment": null,
          "pool": "metal-ec2-c5n-centos-8s-x86_64",
          "reusable": false,
          "data": {
            "provision": {
              "ec2_instance_id": "i-0ad3ef244d3e595db",
              "ec2_instance_type": "c5n.metal",
              "hostname": "n27-25-177.pool.ci.centos.org",
              "ipaddr": "172.27.25.177",
              "public_hostname": "ec2-54-144-113-35.compute-1.amazonaws.com",
              "public_ipaddress": "54.144.113.35",
              "ssh_user": "root" # added by @evgeni
            },
            "nodes_spec": {
              "quantity": 1,
              "pool": "metal-ec2-c5n-centos-8s-x86_64"
            }
          },
          "id": 9208,
          "state": "deployed"
        }
      ]