Description

Presently, if output format specified is json (--format=json), it prints a json object, but the output is prefixed by a key-value pair as header, which is not json. As a result, if someone wants to programmatically parse the json output, it would fail. In this PR, we are removing the header for json formats.

⚠️ The downside is, it also means we are dropping the data that falls outside json format. Let's discuss if that is accepable.

Before:

$ vip app 3202 --format=json
===================================
+ id: 3202
+ name: pmc-thr
+ repo: wpcomvip/pmc-thr
===================================
[
	{
		"id": 3202,
		"appId": 3202,
		"name": "production",
		"type": "production",
		"branch": "master",
		"currentCommit": "944a330",
		"primaryDomain": "www.hollywoodreporter.com",
		"launched": true
	},
...

After:

$ vip app 3202 --format=json
[
	{
		"id": 3202,
		"appId": 3202,
		"name": "production",
		"type": "production",
		"branch": "master",
		"currentCommit": "944a330",
		"primaryDomain": "www.hollywoodreporter.com",
		"launched": true
	},
...

How to test

1. Pull the PR
2. rm -rf dist && npm run build && npm link
3. Run node ./dist/bin/vip app 3202 and node ./dist/bin/vip app 3202 --format=json