genkernelnext-68: Cannot start intel RST RAID volumes via mdadm

[tlhonmey]

I don't know if it works with other MDADM arrays, but with ones based on Intel's RST firmware RAID it detects the controller device, but then doesn't detect the actual storage volumes.

using --all-ramdisk-modules doesn't help, so it's probably not a missing module. I'm not sure what else it might be.

[tlhonmey]

So the problem is that the Intel RST RAID (and possibly other formats) has containers which contain volumes. The current setup assembles the container, but never checks for anything inside it.

#73 has a potential fix that shouldn't break anyone else's stuff (but it would be good to test it more thoroughly than I am currently capable of.)