Add regression test which verifies that options -P and -i cannot be used

together.

MFC after:	3 days

tools/regression/geom_eli/init-i-P.t

@@ -0,0 +1,22 @@
+#!/bin/sh
+# $FreeBSD$
+
+base=`basename $0`
+no=45
+sectors=100
+keyfile=`mktemp /tmp/$base.XXXXXX` || exit 1
+mdconfig -a -t malloc -s `expr $sectors + 1` -u $no || exit 1
+
+echo "1..1"
+
+dd if=/dev/random of=${keyfile} bs=512 count=16 >/dev/null 2>&1
+
+geli init -i 64 -P -K ${keyfile} md${no} 2>/dev/null
+if [ $? -ne 0 ]; then
+	echo "ok 1"
+else
+	echo "not ok 1"
+fi
+
+mdconfig -d -u $no
+rm -f $keyfile