Fix the privilege escalation bug

src/argo_nodeos_config.cpp

@@ -773,6 +773,8 @@ int main(int argc, char** argv)
 	/* We perform the execve(2) after all the cleanup is done.  */
 	if (exec_argv)
 	{
+	    if (setuid(getuid()) == -1)
+		argo_exit(EXIT_FAILURE, "Dropping privileges failed", errno);
 	    execvp(exec_argv[0], exec_argv);
 	    argo_exit(EXIT_FAILURE, "Command execution failed", errno);
 	}