* 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

* test for gc

* change version to 1.3.0

* check and add some license files

* check and add some license files

* revert
Co-authored-by: Nbaoliang <baoliang@analysys.com.cn>