cannot multi attach enabled volume after swap volume

[norman shen]

Description
===========

detach a multi-attach enabled volume failed after swapping volume.

Steps to reproduce
==================

1. Create two volume type with multi attach enabled (A, B)
2. Create a new volume using type A
3. attach it a server
4. Retype this volume to type B
5. wait for it succeeds and detach it will cause a failure

Expected result
===============

volume should be successfully detached

Actual result
=============

failed because nova-compute uses a non existent volume id from connection
info

Environment
===========

1. openstack nova victoria
2. ubuntu 18.04 with docker image using 20.04

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/nova/+/798968