This patch revises the documentation of the interoperable image import
feature available to admin operators to concisely describe Stein and
later releases.
Changes include:
- Remove enable_image_import option because it is no longer available
since the release of Stein
- Simplify the language of the v1 API being deprecated
Change-Id: Ic155afd6de5b37a25743457e9a7ddd5a45dac4e8
Closes-Bug: #1808814
30f821c624