Allow kernel log messages to console with loglevel=7

Since Finit v4.0 kernel console output has been silenced just prior to
the banner being printed, unless finit.debug mode was enabled.  This
patch makes sure to check the kernel loglevel, if it's >= 7, finit no
longer disables kernel console ouput.

Consequently, you now need 'quiet' on your kernel command line, or a
loglevel < 7 for a quiet boot, at least until a syslogd takes over.

This means that you now can debug the kernel and finit independently,
which should be a great comfort to anyone doing bringup or any form of
kernel debugging.

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

src/finit.h

@@ -114,6 +114,7 @@ extern int    debug;
 extern int    rescue;
 extern int    single;
 extern int    bootstrap;
+extern int    kerndebug;
 extern char  *rcsd;
 extern char  *sdown;
 extern char  *network;