The commit [1] added a THT parameter that can set the maximum number of
disks that can be attached to a single guest. Refactored VirtioSCSIDisk
into ultimately three new classes.
* VirtioSCSIBase - parent class hold standard setup and supporting
methods for test cases
* VirtioSCSIDiskMultiAttachment - repuprose of the test methods from
VirtioSCSIDisk which are meant to test guest support of six or more
disks
* VirtioSCSIDiskRestrictAttachments - New test method that validates
[1] is being enforced correctly.
Since [1] could be set to a value less than six, added skip checks for
VirtioSCSIDiskMultiAttachment if the max allowed disks that can be
attached are six or less.
[1] https://review.opendev.org/c/openstack/puppet-nova/+/708666/
Change-Id: I78f7f47ffa2644c71945bba2b5c1af29e0603363
9f98d0aaf9