---
features:
  - Adds a new pair of options to create_image_snapshot(), wait and timeout,
    to have the function wait until the image snapshot being created goes
    into an active state.
  - Adds a new function wait_for_image() which will wait for an image to go
    into an active state.

Add release notes for new create_image_snapshot() args
Add release notes for new create_image_snapshot() args

This commit adds a new release note to describe the new options added
to create_image_snapshot().

Change-Id: Ic69d604c52a669af68cef1c06d5c455b27cef276
