Splits the existing abandon action into two actions as
below:
1. export: User is recommended to run export successfully
before doing the abandon action. It returns the stack
data, which can be used for adopting stack.
2. abandon: Abandons the given stack
Partial-Bug: #1353670
Co-Authored-By: Jason Dunsmore <jasondunsmore@gmail.com>
Change-Id: I65264d91b1378df9cb3e492bc6ccaa778940dd6b