config: Change [volume] catalog_type default

Start using the 'block-storage' catalog type, which for DevStack has
pointed to the Cinder v3 API for many years now [1].

[1] https://review.opendev.org/c/openstack/devstack/+/565479

Change-Id: I8c9e5bfc2722ccd493c062cbb5e52cbc98f5ddc7
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
3 files changed