Repository: kubernetes
Issue: kubectl convert should not add empty values,  creationTimestamp, or status
Labels: priority/backlog,area/kubectl,sig/api-machinery,lifecycle/frozen

I've recently starting using the `kube-version-change` command to convert some k8s configs and get the results below. I'm wondering if it would be better if we omitted empty values, status, and fields like `creationTimestamp`
### Before:

```
{
    "id": "pgview-stable-v1",
    "kind": "ReplicationController",
    "apiVersion": "v1beta1",
    "desiredState": {
        "replicas": 1,
        "replicaSelector": {
            "name": "pgview-stable-v1",
            "environment": "production",
            "app": "pgview",
            "track": "stable"
        },
        "podTemplate": {
            "desiredState": {
                "manifest": {
                    "id": "pgview-stable-v1",
                    "version": "v1beta1",
                    "containers": [
                        {
                            "name": "pgview",
                            "image": "pgview:1.0.0",
                            "imagePullPolicy": "PullIfNotPresent",
                            "cpu": 100,
                            "memory": 10000000,
                            "ports": [{"containerPort": 80}]
                        },
                        {
                            "name": "memcached",
                            "image": "memcached",
                            "imagePullPolicy": "PullIfNotPresent",
                            "cpu": 100,
                            "memory": 10000000,
                            "ports": [{"containerPort": 11211}]
                        }
                    ]
                }
            },
            "labels": {
                "name": "pgview-stable-v1",
                "environment": "production",
                "app": "pgview",
                "track": "stable"
            }
        }
    },
    "labels": {
        "name": "pgview-stable-v1",
        "app": "pgview",
        "environment": "production",
        "track": "stable"
    }
}
```
### After:

```
{
  "kind": "ReplicationController",
  "apiVersion": "v1beta3",
  "metadata": {
    "name": "pgview-stable-v1",
    "creationTimestamp": null,
    "labels": {
      "app": "pgview",
      "environment": "production",
      "name": "pgview-stable-v1",
      "track": "stable"
    }
  },
  "spec": {
    "replicas": 1,
    "selector": {
      "app": "pgview",
      "environment": "production",
      "name": "pgview-stable-v1",
      "track": "stable"
    },
    "template": {
      "metadata": {
        "creationTimestamp": null,
        "labels": {
          "app": "pgview",
          "environment": "production",
          "name": "pgview-stable-v1",
          "track": "stable"
        }
      },
      "spec": {
        "volumes": null,
        "containers": [
          {
            "name": "pgview",
            "image": "pgview:1.0.0",
            "ports": [
              {
                "containerPort": 80,
                "protocol": "TCP"
              }
            ],
            "resources": {
              "limits": {
                "cpu": "100m",
                "memory": "10000000"
              }
            },
            "terminationMessagePath": "/dev/termination-log",
            "imagePullPolicy": "IfNotPresent",
            "capabilities": {}
          },
          {
            "name": "memcached",
            "image": "memcached",
            "ports": [
              {
                "containerPort": 11211,
                "protocol": "TCP"
              }
            ],
            "resources": {
              "limits": {
                "cpu": "100m",
                "memory": "10000000"
              }
            },
            "terminationMessagePath": "/dev/termination-log",
            "imagePullPolicy": "IfNotPresent",
            "capabilities": {}
          }
        ],
        "restartPolicy": "Always",
        "dnsPolicy": "ClusterFirst"
      }
    }
  },
  "status": {
    "replicas": 0
  }
}
```