Description of problem:

Last week I struggled with a customer trying to restore IMSM Software Raid. It appears that the current code doesn't work at all.
I've come up with PR https://github.com/rear/rear/pull/2702 which should be easily backportable to RHEL7.

I think it's a must-have because it's very complicated to restore manually in case software raid is present.

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

2.4 and 2.6

How reproducible:

Always

Steps to Reproduce:
1. Install a QEMU/KVM with 2 SCSI Disks having a SCSI ID

XML and kickstart attached for reference.

2. Create ReaR ISO

3. Clone the VM and try to restore it

Actual results:

Various failures in the disk restore phase