Add runtime and network info in VM object

[darkowlzz]

This updates the VM API to add container runtime and network plugin info in
status.

Containerd + CNI:

  "status": {
    "running": true,
    "runtime": {
      "id": "ignite-206534faa94aee0b",
      "name": "containerd"
    },
    "startTime": "2020-08-03T14:07:09Z",
    "network": {
      "plugin": "cni",
      "ipAddresses": [
        "10.61.0.4"
      ]
    },

Docker + Docker-bridge:

  "status": {
    "running": true,
    "runtime": {
      "id": "9a37789bd112c6683d0d7389fd2f4c55aa87971e6e11d4e1df09bb5fefaa9664",
      "name": "docker"
    },
    "startTime": "2020-08-03T14:08:23Z",
    "network": {
      "plugin": "docker-bridge",
      "ipAddresses": [
        "172.17.0.2"
      ]
    },

Adds custom conversion for v1alpha2 API in conversion.go.
Updates the test golden files to have the new status fields.