Refactor: introduce telinit and a new initctl tool w/ API

- Reduce size of `helpers.c`, for linking against new `initctl` tool,
  by moving out functions to `pid.c` and `exec.c`
- Add `AF_UNIX` API to Finit, to complement old `/dev/initctl` FIFO
- Let old FIFO API be used by init/telinit: `init <q | 1-9>`
- Move all advanced initctl code from `client.c` to `initctl.c`, yes
  its a bit confusing to call the *new* tool the same as the old FIFO
  but this is more in line with what, e.g Upstart does.
- Move all advanced server side code from `plugins/initctl.c` to `api.c`
- Update TODO with upcoming inetd syntax change and dynamic events.
- Temporarily fix display of inetd services from `initctl status -v`

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

Makefile

@@ -33,11 +33,11 @@ DEV         = $(NAME)-dev
 ARCHTOOL    = `which git-archive-all`
 ARCHIVE     = $(PKG).tar
 ARCHIVEZ    = ../$(ARCHIVE).xz
-EXEC        = finit reboot
+EXEC        = finit initctl reboot
 HEADERS     = plugin.h svc.h helpers.h queue.h
 DISTFILES   = LICENSE README CHANGELOG finit.conf services
-OBJS        = finit.o client.o conf.o helpers.o sig.o svc.o service.o \
-	      plugin.o tty.o inetd.o
+OBJS        = finit.o api.o client.o conf.o exec.o helpers.o pid.o sig.o \
+	      svc.o service.o plugin.o tty.o inetd.o
 
 TOPDIR      = $(shell pwd)
 -include config.mk
@@ -74,6 +74,8 @@ config.h: configure
 
 finit: $(OBJS)
 
+initctl: initctl.o svc.o helpers.o
+
 reboot: reboot.o $(DEPLIBS)
 
 install-exec: all
@@ -83,8 +85,8 @@ install-exec: all
 		printf "  INSTALL $(DESTDIR)$(sbindir)/$$file\n";   	\
 		$(STRIPINST) $$file $(DESTDIR)$(sbindir)/$$file; 	\
 	done
-	printf "  INSTALL $(DESTDIR)$(sbindir)/initctl\n"
-	@ln -sf  finit $(DESTDIR)$(sbindir)/initctl
+	printf "  INSTALL $(DESTDIR)$(sbindir)/telinit\n"
+	@ln -sf  finit $(DESTDIR)$(sbindir)/telinit
 	$(MAKE) -C libite  install-exec
 	$(MAKE) -C plugins install