fix: refactor locks to apply them uniquely per node (#11052)

This refactor is done for few reasons below

- to avoid deadlocks in scenarios when number
  of nodes are smaller < actual erasure stripe
  count where in N participating local lockers
  can lead to deadlocks across systems.

- avoids expiry routines to run 1000 of separate
  network operations and routes per disk where
  as each of them are still accessing one single
  local entity.

- it is ideal to have since globalLockServer
  per instance.

- In a 32node deployment however, each server
  group is still concentrated towards the
  same set of lockers that partipicate during
  the write/read phase, unlike previous minio/dsync
  implementation - this potentially avoids send
  32 requests instead we will still send at max
  requests of unique nodes participating in a
  write/read phase.

- reduces overall chattiness on smaller setups.

cmd/peer-rest-server.go

@@ -48,12 +48,7 @@ func (s *peerRESTServer) GetLocksHandler(w http.ResponseWriter, r *http.Request)
 	}
 
 	ctx := newContext(r, w, "GetLocks")
-
-	llockers := make(GetLocksResp, 0, len(globalLockServers))
-	for _, llocker := range globalLockServers {
-		llockers = append(llockers, llocker.DupLockMap())
-	}
-	logger.LogIf(ctx, gob.NewEncoder(w).Encode(llockers))
+	logger.LogIf(ctx, gob.NewEncoder(w).Encode(globalLockServer.DupLockMap()))
 
 	w.(http.Flusher).Flush()