hpc_logger lost last lines when core

[qinzuoyan]

when using hpc_logger, if coredump, the last (also the most important) lines will lost because not flushed.

[imzhenyu]

Windows allows register an exception handler via ::SetUnhandledExceptionFilter(TopLevelFilter); I'm not sure how Linux does this. If you can register a handler which calls ::dsn::tools::sys_exit.execute(SYS_EXIT_EXCEPTION), then the issue should be fixed.

[imzhenyu]

So this is fixed and we may close the issue? @shengofsun @qinzuoyan