fix: handle concurrent lockers with multiple optimizations (#10640)

- select lockers which are non-local and online to have
  affinity towards remote servers for lock contention

- optimize lock retry interval to avoid sending too many
  messages during lock contention, reduces average CPU
  usage as well

- if bucket is not set, when deleteObject fails make sure
  setPutObjHeaders() honors lifecycle only if bucket name
  is set.

- fix top locks to list out always the oldest lockers always,
  avoid getting bogged down into map's unordered nature.

cmd/peer-rest-server.go

@@ -47,7 +47,7 @@ func (s *peerRESTServer) GetLocksHandler(w http.ResponseWriter, r *http.Request)
 
 	ctx := newContext(r, w, "GetLocks")
 
-	llockers := make([]map[string][]lockRequesterInfo, 0, len(globalLockServers))
+	llockers := make(GetLocksResp, 0, len(globalLockServers))
 	for _, llocker := range globalLockServers {
 		llockers = append(llockers, llocker.DupLockMap())
 	}