[json] Launch.json recommending properties before defining launch/attach

[vsccarl]

• VSCode Version: 0.10.12-alpha
• OS Version: Windows 10

Steps to Reproduce:

1. Open launch.json file
2. Add another debug configuration with name and type

Actual:
It is suggesting adding program and cwd properties before it knows what configuration you'll choose.

Expected:
Only suggests adding request property until you have defined request and does not show launch/attach specific properties.

[isidorn]

This is a feature request against our json schema which currently does not support his.
Forwarding to @aeschli

[aeschli]

This is pretty tricky to implement in the schema validator.

[aeschli]

closing as won't fix