support site replication to replicate IAM users,groups (#14128)

- Site replication was missing replicating users,
  groups when an empty site was added.

- Add site replication for groups and users when they
  are disabled and enabled.

- Add support for replicating bucket quota config.

cmd/erasure.go

@@ -214,7 +214,7 @@ func getDisksInfo(disks []StorageAPI, endpoints []Endpoint) (disksInfo []madmin.
 				}
 			}
 			di.Metrics = &madmin.DiskMetrics{
-				APILatencies: make(map[string]string),
+				APILatencies: make(map[string]interface{}),
 				APICalls:     make(map[string]uint64),
 			}
 			for k, v := range info.Metrics.APILatencies {