Conditionalize etc/rc.d/{zfs,zvol} install on MK_ZFS != no

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

etc/rc.d/Makefile

@@ -127,8 +127,6 @@ FILES=	DAEMON \
 	ypset \
 	ypupdated \
 	ypxfrd \
-	zfs \
-	zvol
 
 .if ${MK_ACCT} != "no"
 FILESGROUPS+=	ACCT
@@ -302,6 +300,13 @@ FILES+=		hostapd
 FILES+=		wpa_supplicant
 .endif
 
+.if ${MK_ZFS} != "no"
+FILESGROUPS+=	ZFS
+ZFS+=		zfs
+ZFS+=		zvol
+ZFSPACKAGE=	zfs
+.endif
+
 .for fg in ${FILESGROUPS}
 ${fg}MODE?=	${BINMODE}
 .endfor