modify auto send checkpoint

Signed-off-by: franklin <flin1866@gmail.com>
Merge remote-tracking branch 'remotes/spark/workspace'
Merge remote-tracking branch 'remotes/bruce/master'
the default difficult is needed

Signed-off-by: spark.huang <240401736@qq.com>
remove the default datadir

Signed-off-by: spark.huang <240401736@qq.com>
remove the json test code

Signed-off-by: spark.huang <240401736@qq.com>
sync with DSPay

Signed-off-by: franklin <flin1866@gmail.com>
modify config file

Signed-off-by: franklin <flin1866@gmail.com>
Merge remote-tracking branch 'remotes/spark/workspace'
bruce add a network seed.