re-attach offline drive after new drive replacement (#10416)

inconsistent drive healing when one of the drive is offline
while a new drive was replaced, this change is to ensure
that we can add the offline drive back into the mix by
healing it again.

cmd/endpoint.go

@@ -24,6 +24,7 @@ import (
 	"net/url"
 	"path"
 	"path/filepath"
+	"reflect"
 	"runtime"
 	"strconv"
 	"strings"
@@ -203,6 +204,21 @@ type ZoneEndpoints struct {
 // EndpointZones - list of list of endpoints
 type EndpointZones []ZoneEndpoints
 
+// GetLocalZoneIdx returns the zone which endpoint belongs to locally.
+// if ep is remote this code will return -1 zoneIndex
+func (l EndpointZones) GetLocalZoneIdx(ep Endpoint) int {
+	for i, zep := range l {
+		for _, cep := range zep.Endpoints {
+			if cep.IsLocal && ep.IsLocal {
+				if reflect.DeepEqual(cep, ep) {
+					return i
+				}
+			}
+		}
+	}
+	return -1
+}
+
 // Add add zone endpoints
 func (l *EndpointZones) Add(zeps ZoneEndpoints) error {
 	existSet := set.NewStringSet()