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/xl-storage-disk-id-check.go

@@ -138,6 +138,10 @@ func (p *xlStorageDiskIDCheck) IsOnline() bool {
 	return storedDiskID == p.diskID
 }
 
+func (p *xlStorageDiskIDCheck) LastConn() time.Time {
+	return p.storage.LastConn()
+}
+
 func (p *xlStorageDiskIDCheck) IsLocal() bool {
 	return p.storage.IsLocal()
 }