use dnscache resolver for resolving command line endpoints (#14135)

this helps in caching the resolved values early on, avoids
causing further resolution for individual nodes when
object layer comes online.

this can speed up our startup time during, upgrades etc by
an order of magnitude.

additional changes in connectLoadInitFormats() and parallelize
all calls that might be potentially blocking.

cmd/server-main.go

@@ -580,22 +580,23 @@ func serverMain(ctx *cli.Context) {
 	// Initialize users credentials and policies in background right after config has initialized.
 	go globalIAMSys.Init(GlobalContext, newObject, globalEtcdClient, globalNotificationSys, globalRefreshIAMInterval)
 
-	// Initialize transition tier configuration manager
-	if globalIsErasure {
-		if err := globalTierConfigMgr.Init(GlobalContext, newObject); err != nil {
-			logger.LogIf(GlobalContext, err)
-		}
-	}
-
 	initDataScanner(GlobalContext, newObject)
 
-	if globalIsErasure { // to be done after config init
+	// Initialize transition tier configuration manager
+	if globalIsErasure {
 		initBackgroundReplication(GlobalContext, newObject)
 		initBackgroundTransition(GlobalContext, newObject)
-		globalTierJournal, err = initTierDeletionJournal(GlobalContext)
-		if err != nil {
-			logger.FatalIf(err, "Unable to initialize remote tier pending deletes journal")
-		}
+
+		go func() {
+			if err := globalTierConfigMgr.Init(GlobalContext, newObject); err != nil {
+				logger.LogIf(GlobalContext, err)
+			}
+
+			globalTierJournal, err = initTierDeletionJournal(GlobalContext)
+			if err != nil {
+				logger.FatalIf(err, "Unable to initialize remote tier pending deletes journal")
+			}
+		}()
 	}
 
 	// initialize the new disk cache objects.
@@ -609,7 +610,7 @@ func serverMain(ctx *cli.Context) {
 	}
 
 	// Prints the formatted startup message, if err is not nil then it prints additional information as well.
-	printStartupMessage(getAPIEndpoints(), err)
+	go printStartupMessage(getAPIEndpoints(), err)
 
 	if globalActiveCred.Equal(auth.DefaultCredentials) {
 		msg := fmt.Sprintf("WARNING: Detected default credentials '%s', we recommend that you change these values with 'MINIO_ROOT_USER' and 'MINIO_ROOT_PASSWORD' environment variables", globalActiveCred)
@@ -636,7 +637,17 @@ func serverMain(ctx *cli.Context) {
 	if serverDebugLog {
 		logger.Info("== DEBUG Mode enabled ==")
 		logger.Info("Currently set environment settings:")
+		ks := []string{
+			config.EnvAccessKey,
+			config.EnvSecretKey,
+			config.EnvRootUser,
+			config.EnvRootPassword,
+		}
 		for _, v := range os.Environ() {
+			// Do not print sensitive creds in debug.
+			if contains(ks, strings.Split(v, "=")[0]) {
+				continue
+			}
 			logger.Info(v)
 		}
 		logger.Info("======")