Add --output flag to various commands

[divolgin]

Added for various commands with some exceptions:

• commands that don't support KOTS
• customer license download

There were two existing commands that expected "text" instead of "table". They now support both, but only "table" will be documented"

$ ./bin/replicated channel ls --output json
Update available: v0.60.0
To automatically upgrade, run "replicated version upgrade"
[
  {
    "id": "2ULZUQp3A9bH79uS3rwSaGArWig",
    "name": "Stable",
    "description": "",
    "channelSlug": "stable",
    "releaseSequence": 0,
    "releaseLabel": "",
    "isArchived": false,
    "isHelmOnly": false
  },
  {
    "id": "2ULZUSyJypjZLc6xkBZfReDMqPz",
    "name": "Beta",
    "description": "",
    "channelSlug": "beta",
    "releaseSequence": 47,
    "releaseLabel": "1.0.16",
    "isArchived": false,
    "isHelmOnly": true
  },
  {
    "id": "2ULZURFgOKVpjtpWG4xJUBKL8Rc",
    "name": "Unstable",
    "description": "",
    "channelSlug": "unstable",
    "releaseSequence": 50,
    "releaseLabel": "0.0.4",
    "isArchived": false,
    "isHelmOnly": false
  }
]

$ ./bin/replicated app ls --output json
Update available: v0.60.0
To automatically upgrade, run "replicated version upgrade"
[
  {
    "app": {
      "id": "28ysVLZT3OiZLXuOVW3ZUDXRu9D",
      "name": "okteto-kots",
      "scheduler": "kots",
      "slug": "okteto-kots",
      "isFoundation": false
    },
    "channels": [
      {
        "id": "28ysVXknIJUl9ncG4xVRHgw5tUt",
        "name": "Stable",
        "description": "",
        "channelSlug": "stable",
        "releaseSequence": 170,
        "releaseLabel": "",
        "isArchived": false,
        "isHelmOnly": true
      },
...

$ ./bin/replicated release lint --yaml-dir ./yaml-kots --output json
Update available: v0.60.0
To automatically upgrade, run "replicated version upgrade"
[
  {
    "rule": "helm-chart-missing",
    "type": "error",
    "path": "",
    "message": "Could not find helm chart manifest for archive 'yaml-kots/postgresql-11.9.2.tgz'",
    "positions": null
  }
]
Error: One or more errors of severity "error" or higher were found