This is the follow-up patch addresses outstanding comments for
commit 689dbf6b5c6ec1dcaf1fa37d288518c91eedf4ec.
Change-Id: I72c189988c5c274c32d61a2b9aea5a84da2b2c6e
Related-Bug: #1526449
This adds documentation for rescue mode, including the finalize_rescue
command as well as upstream support in agent images.
Change-Id: Id0834941ee4dacf2e7c0feaa65126d63e8a97c39
Partial-Bug: 1526449