Store RUN_LVL in UTMP and change RUNLEVEL_BOOT from 10 to 0

Standard init implementations save current and previous runlevels
in utmp, now finit does too.  Also, the initial runlevel at boot
has changed from 10 to the more obvious 0.

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

svc.h

@@ -42,7 +42,6 @@ typedef enum {
 	SVC_CMD_RUN		/* Like task, but wait for completion */
 } svc_type_t;
 
-#define RUNLEVEL_BOOT    10
 #define FINIT_SHM_ID     0x494E4954  /* "INIT", see ascii(7) */
 #define MAX_ARG_LEN      64
 #define MAX_STR_LEN      64