Add multiattach skip check to VolumeRetypeMultiattachTest

The new VolumeRetypeMultiattachTest added in change [1] may
break drivers that don't support the multiattach feature.

This patch fixes this issue by adding a skip check for
multiattach to the VolumeRetypeMultiattachTest test class.

[1] https://review.opendev.org/c/openstack/tempest/+/956225

Change-Id: Ie3df5e603addb05a8401f119ac47515a276e69d6
Signed-off-by: Fernando Ferraz <fernandoperches@gmail.com>
1 file changed