A bug in test_create_multiple was fixed by this patch [1]. As the test
is part of the interop guidelines we should include this fix in
refstack-client.

[1] https://review.opendev.org/c/openstack/tempest/+/875751

Depends-On: Ie127c2ed159da8a6bc780919cdd4def44e457efb
Change-Id: Icfc4c4f270ee559128b165ffa032be0460294d48