This adds three new custom storage tests and some needles to
support them, and tweaks the custom storage methods a bit to
address some things that cropped up in writing the tests. A
new method is added for changing the filesystem, as that's
a distinct operation from changing the device type.
This also restores the previous behaviour of select_disks()
where it handled selecting custom partitioning when needed.
Turns out it's pretty common to use regex'es in perl! Who'd'a
thought.
A corresponding commit to add the tests to openqa_fedora_tools
is coming.
There's no post-install step for the tests yet; I'll try and
write those up and add them soon.
Yep, I think if we want select_disks() to handle clicking on "custom partitioning", this is the best solution.