Move fork() of console to run_getty() and remove startx conf option

New function helpers.c:run_getty() refactored from main(). Used to
start a default console getty.

Removed startx finit.conf option, superseded by service statement,
see examples/finit.conf for a working use case.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

helpers.h

@@ -42,6 +42,7 @@ void    set_hostname    (char *hostname);
 
 int     run             (char *cmd);
 int     run_interactive (char *cmd, char *fmt, ...);
+pid_t   run_getty       (char *cmd, char *argv[]);
 int	run_parts	(char *dir, ...);
 
 #endif /* FINIT_HELPERS_H_ */