Use actual storage devices for gating tests for stratisd in Fedora

[mulkieran]

It seems that the functionality is now available.

Example:

provision:

  how: virtual
  hardware:
    disk:
      - size: ">50GiB"
      - size: ">50GiB"
      - size: ">50GiB"

We can experiment w/ getting this to work in Fedora rawhide.

[mulkieran]

We'll need to update the TMT configuration file and also pass the devices as arguments when invoking the test scripts.How do we know the device nodes ?

[mulkieran]

We are presently stuck a bit on how to find the storage nodes. We actually could use loop devices, honestly, but those can be flaky and don't test quite so well as real devices. I think we should wait for the real devices to be provided.

[mulkieran]

Unfortunately, using loop devices is proving tricky: #664