print proper certinfo on console when starting up (#9479)

also potentially fix a race in certs.go implementation
while accessing tls.Certificate concurrently.

cmd/gateway-startup-msg.go

@@ -43,8 +43,10 @@ func printGatewayStartupMessage(apiEndPoints []string, backendType string) {
 
 	// SSL is configured reads certification chain, prints
 	// authority and expiry.
-	if globalIsSSL {
-		printCertificateMsg(globalPublicCerts)
+	if color.IsTerminal() && !globalCLIContext.Anonymous {
+		if globalIsSSL {
+			printCertificateMsg(globalPublicCerts)
+		}
 	}
 }