MRF: Better detection of non stable disks (#12252)

MRF does not detect when a node is disconnected and reconnected quickly
this change will ensure that MRF is alerted by comparing the last disk
reconnection timestamp with the last MRF check time.

Signed-off-by: Anis Elleuch <anis@min.io>

Co-authored-by: Klaus Post <klauspost@gmail.com>

cmd/storage-interface.go

@@ -20,6 +20,7 @@ package cmd
 import (
 	"context"
 	"io"
+	"time"
 )
 
 // StorageAPI interface.
@@ -28,7 +29,9 @@ type StorageAPI interface {
 	String() string
 
 	// Storage operations.
-	IsOnline() bool // Returns true if disk is online.
+	IsOnline() bool      // Returns true if disk is online.
+	LastConn() time.Time // Returns the last time this disk (re)-connected
+
 	IsLocal() bool
 
 	Hostname() string   // Returns host name if remote host.