[Gentoo] Setting up a diskless cluster, vol. 5: Use the latest versions

After searching Gentoo’s Bugzilla, I found the problem with LVM starting before RAID. It’s already fixed, but not in the stable version of baselayout. Unstable package number one, here I come.

Still not sure about the nonpersistent error, but it would be nice if that resolved itself after the baselayout upgrade.