Remove /dev/console from the jail /dev environment. It's probably not

strictly a security hole, but neither is it a very good idea.  Replace
it with a symlink to /dev/null to happify programs that expect it.

It is suggested that users of the jail environment modify the jail's
syslog.conf to not send stuff to /dev/console, but instead syslog
it somewhere else.  Such as a loghost, potentially even to the host
environment's syslog.

Approved by:	jkh

etc/MAKEDEV

@@ -319,9 +319,10 @@ std)
 
 jail)
 	sh MAKEDEV std pty0
-	rm mem kmem pci io klog		# for security
+	rm mem kmem pci io klog console		# for security
 	ln -sf null mem			# for libkvm (ab)users
 	ln -sf null kmem		# --//--
+	ln -sf null console
 	;;
 
 mach-4)