handle fresh setup with mixed drives (#10273)

fresh drive setups when one of the drive is
a root drive, we should ignore such a root
drive and not proceed to format.

This PR handles this properly by marking
the disks which are root disk and they are
taken offline.

pkg/madmin/info-commands.go

@@ -270,6 +270,7 @@ type ServerProperties struct {
 // Disk holds Disk information
 type Disk struct {
 	Endpoint        string  `json:"endpoint,omitempty"`
+	RootDisk        bool    `json:"rootDisk,omitempty"`
 	DrivePath       string  `json:"path,omitempty"`
 	State           string  `json:"state,omitempty"`
 	UUID            string  `json:"uuid,omitempty"`