Normalize volume_type_multiattach option with upstream

followup to I5f68ef56fcc55dfc636936dabb5e6ad761579519

put it in [volume] section [0]

[0] https://review.opendev.org/c/openstack/tempest/+/875372

Related-Issue: PRODX-34963
Change-Id: Id818a5bfccbc0b81bb8c1de2229a0b033bdb9a5c
4 files changed