change max length of user name to 39 (#2856)

* fix bug: send task result to master until success.

* fix bug: send task result to master until success.

* add sleep

* set null if send result failed

* set null if send result failed

* change max length of username to 39
Co-authored-by: Nbaoliang <baoliang@analysys.com.cn>

dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/Constants.java

@@ -299,7 +299,7 @@ public final class Constants {
     /**
      * user name regex
      */
-    public static final Pattern REGEX_USER_NAME = Pattern.compile("^[a-zA-Z0-9._-]{3,20}$");
+    public static final Pattern REGEX_USER_NAME = Pattern.compile("^[a-zA-Z0-9._-]{3,39}$");
 
     /**
      * email regex