Launch Instance yaml editor

Registered by Lin Hua Cheng

Summary
=======

Provide the ability for users to write and validate the user data on the Launch Instance panel.

Motivation
========

User wants to add cloud-config data when booting up their instance, they use a yaml formatted data as input. User have to go to external website or editor to write the yaml data and validate it.

Description
=========
Add a yaml editor in the Launch Instance panel, allow the user to validate the file with highlighting which lines are invalid.

UX
===

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Lin Hua Cheng
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
David Lyle

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