This adds the support for new style volume attachments
to the swap volume operation.
If the existing volume attachment (old_volume) was created
using the new flow, it will have attachment_id set. Based
on that the API will create a new volume attachment for the
volume being swapped to and then pass that attachment to the
compute over RPC. Note that we do not yet create new-style
volume attachments so this is all no-op code for now. And
when we do start creating new-style volume attachments, that
will only be allowed when Cinder is new enough (3.27 microversion)
and all compute services are upgraded, so we don't perform
any nova-compute service version checks here.
Once on the compute, we key off the new_attachment_id being
passed from the API to tell if we should use the old or new
style calls to Cinder. For example, initialize_connection and
terminate_connection are replaced with attachment_update and
attachment_delete.
Co-Authored-By: Matt Riedemann <mriedem.os@gmail.com>
Co-Authored-By: John Griffith <john.griffith8@gmail.com>
Depends-On: I23391300468cc5e2f45a12d5ad8617ab48c21e6a
Partially Implements: blueprint cinder-new-attach-apis
Change-Id: I4b8bd01f1ffe2640fe7313213bf853d2e1bef9dd
ae53c22457