If external dependencies are unavailable, cannot support RAID levels.
If external dependencies are unavailable, cannot support RAID levels.

Related: #12

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

vpodzime/blivet,vojtechtrefny/blivet,rvykydal/blivet,vpodzime/blivet,rhinstaller/blivet,jkonecny12/blivet,rhinstaller/blivet,vojtechtrefny/blivet,AdamWill/blivet,jkonecny12/blivet,rvykydal/blivet,AdamWill/blivet