Remove unused 'slaves' variable.
Remove unused 'slaves' variable.

It is initialized and modified, but never actually used.

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

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