In Launch Instance work flow Configuration step, `DiskConfig`
and `ConfigDrive` should be handle only when certain extension
on navaExtension are enbled respectively.
Created a generic way to make this happen.
Co-Authored-By: Travis Tripp <travis.tripp@hp.com>
Change-Id: I98a91ff9e1ae78310fb7e568cce909e76e610cf8
Closes-Bug: #1435155