Add support for starting/stopping SysV init scripts

This patch adds initial support for starting a SysV init script in a
runlevel, and stopping it when leaving a runlevel.

    sysv [LVLS] <COND> /path/to/script.sh -- Optional Description

The SysV /etc/inittab file, which may use /etc/init.d, or /etc/rcN.d,
is still not supported.  A separate plugin would be required for this,
see the documentation for more information.

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

src/sm.c

@@ -117,7 +117,7 @@ restart:
 	switch (sm->state) {
 	case SM_BOOTSTRAP_STATE:
 		_d("Bootstrapping all services in runlevel S from %s", FINIT_CONF);
-		service_step_all(SVC_TYPE_RUN | SVC_TYPE_TASK | SVC_TYPE_SERVICE);
+		service_step_all(SVC_TYPE_RUNTASK | SVC_TYPE_SERVICE);
 		sm->state = SM_RUNNING_STATE;
 		break;