Add a regression test framework for config(1).

The first test, SHADOW_INSTANCE, includes an example of a shadowed
instance:  'child' only attaches to attribute hook, therefore the instance
'child* at parentii?' is shadowed by 'child* at hook?'.

However, that configuration file is still valid, and therefore must be
accepted.

regress/usr.bin/config/Makefile

@@ -0,0 +1,32 @@
+# $NetBSD: Makefile,v 1.1 2005/10/02 21:27:02 cube Exp $
+
+# Those configurations only have to be understood by config(1) without
+# errors.
+
+SIMPLE=	SHADOW_INSTANCE
+
+.include <bsd.obj.mk>
+
+.PHONY: regress clean cleandir
+regress: compile
+cleandir: clean
+clean:
+	@if [ -e compile ]; then rmdir compile; fi
+
+compile:
+	@mkdir compile
+
+.for __conf__ in ${SIMPLE}
+regress: ${__conf__}-regress
+clean: ${__conf__}-clean
+.endfor
+
+.for __conf__ in ${SIMPLE}
+.PHONY: ${__conf__}-regress ${__conf__}-clean
+${__conf__}-regress:
+	@mkdir compile/${__conf__}
+	${TOOL_CONFIG} -s ${.CURDIR}/support -b ./compile/${__conf__} ${.CURDIR}/${__conf__}
+
+${__conf__}-clean:
+	@if [ -d compile/${__conf__} ]; then rm -Rf compile/${__conf__}; fi
+.endfor

regress/usr.bin/config/SHADOW_INSTANCE

@@ -0,0 +1,15 @@
+include "arch/regress/conf/std.regress"
+
+maxusers 4
+
+file-system 	REGRESSFS
+
+master0 	at root
+
+parenti* 	at master?
+parentii* 	at master?
+
+child* 	at hook?
+child* 	at parentii?
+
+config regress root on ?

regress/usr.bin/config/support/arch/regress/conf/Makefile.regress

@@ -0,0 +1,41 @@
+=== INCLUDES BEGIN ===
+
+%INCLUDES
+
+=== INCLUDES END ===
+
+=== OBJS BEGIN ===
+
+%OBJS
+
+=== OBJS END ===
+
+=== CFILES BEGIN ===
+
+%CFILES
+
+=== CFILES END ===
+
+=== SFILES BEGIN ===
+
+%SFILES
+
+=== SFILES END ===
+
+=== LOAD BEGIN ===
+
+%LOAD
+
+=== LOAD END ===
+
+=== RULES BEGIN ===
+
+%RULES
+
+=== RULES END ===
+
+=== MAKEOPTIONSAPPEND BEGIN ===
+
+%MAKEOPTIONSAPPEND
+
+=== MAKEOPTIONSAPPEND END ===

regress/usr.bin/config/support/arch/regress/conf/files.regress

@@ -0,0 +1,2 @@
+maxpartitions 8
+maxusers 2 4 8

regress/usr.bin/config/support/arch/regress/conf/std.regress

@@ -0,0 +1 @@
+machine regress

regress/usr.bin/config/support/conf/files

@@ -0,0 +1,14 @@
+deffs   REGRESSFS
+
+device	master { }
+attach	master at root
+
+define	hook { }
+
+device	parentii:	hook
+attach	parentii at master
+device	parenti:	hook
+attach	parenti at master
+
+device	child
+attach	child at hook