TTY: Major overhaul, move to built-in getty

The TTY handling in Finit has always been a bit of a patch work.  This
commit is an attempt at a first cleanup and simplification.

Included is a brand new built-in getty which should work fine on both
virtual and serial consoles.  It is however completely untested on the
latter serial consoles.

Still TODO: add support for /etc/securetty, add support for actually
setting TERM when calling /bin/login.

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

Makefile.am

@@ -1,6 +1,6 @@
 ACLOCAL_AMFLAGS    = -I m4
 sbin_PROGRAMS      = finit initctl reboot
-finit_SOURCES      = finit.c api.c client.c conf.c exec.c helpers.c pid.c \
+finit_SOURCES      = finit.c api.c client.c conf.c exec.c getty.c helpers.c pid.c \
 		     sig.c svc.c service.c plugin.c tty.c cond.c cond-w.c sm.c
 pkginclude_HEADERS = cond.h finit.h helpers.h inetd.h plugin.h svc.h
 if INETD