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Description of problem:
It would be nice if it were possible to create and/or use degraded RAID1
partitions with Anaconda.  Currently, there's no way to add /dev/null as some of
the replicas, as it is possible to do in /etc/inittab, and it refuses to create
a perfectly-valid RAID1 device out of a single partition.

The reason for me to want such a set up is that I like to keep root and boot
partitions replicated across my disks, but when I want to try a new release, I
like to install it from scratch, and then, when I'm confident I can switch to
it, I remove the old RAID devices and spread the new ones such that the space
that would be otherwise unused until the next release can actually be used for
something useful, namely, speeding up access to the root partition.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Create a single RAID partition
2.Try to create a RAID1 device out of it


Actual Results:  Disk druid refuses to create a 1-disk RAID1 device, and doesn't
offer any way to add more `failed' partitions to the array.

Expected Results:  I'd love to be able to create a RAID1 with say 1 failed
replica, such that I could just raidhotadd my old system partition whenever I
figured I wouldn't need the old root partition any more.

Additional info: