reject mixed drive situations with drives on root disks (#11057)

till now we used to match the inode number of the root
drive and the drive path minio would use, if they match
we knew that its a root disk.

this may not be true in all situations such as running
inside a container environment where the container might
be mounted from a different partition altogether, root
disk detection might fail.

cmd/xl-storage.go

@@ -240,7 +240,7 @@ func newXLStorage(ep Endpoint) (*xlStorage, error) {
 		return nil, err
 	}
 
-	rootDisk, err := disk.IsRootDisk(path)
+	rootDisk, err := disk.IsRootDisk(path, "/")
 	if err != nil {
 		return nil, err
 	}