feat(storage/linstor): Add provisioning type support and multi-disk enhancements for Linstor SR tests

[rushikeshjadhav]

• Introduced --provisioning pytest parameter to enable specifying provisioning type (thin or thick) for Linstor SR.
• Enhanced sr_disks_for_all_hosts to support multiple disks, with validations for "auto" and specific disk configurations.
• Modified lvm_disk to handle multiple devices, ensuring vgcreate and pvcreate commands are executed for all disks collectively.
• Added provisioning_type and storage_pool_name pytest fixtures for dynamic SR configuration.
• Updated Linstor SR test cases to use provisioning_type and storage_pool_name fixtures.
• Improved disk validation and logging for multi-disk configurations.

[stormi]

Adding a new CLI parameter such as --provisioning is a last resort change, because it moves the responsibility for defining it to the caller, when we probably want that our tests, by default, provide both testing for thick and thin provisioning, as their definition.

Couldn't we have test definitions that do both thick and thin, instead?

[rushikeshjadhav]

Couldn't we have test definitions that do both thick and thin, instead?

We can do that. Since this is XOSTOR level, one full cycle (create-test-destroy) with thin and then another full cycle with thick can be added.

Can we retain the CLI option for those callers who want to selectively run in one of the mode?

[stormi]

Can we retain the CLI option for those callers who want to selectively run in one of the mode?

In theory pytest already offers enough selectors to execute a set of tests and not others.