oneshot: Fix old banner

Old banner wasn't conffile, but new ones are. But because the old one wasn't,
opg doesn't have its checksum and thus will not overwrite it with new conffile.

oneshot/scripts/0009-fix-old-banner

+#!/bin/sh
+if [ "`md5sum /etc/banner | cut -f 1 -d ' '`" = ff598dce1de580401bf2a4e1c24a4489 ]; then
+	if [ -f /etc/banner-opkg ]; then
+		mv /etc/banner-opkg /etc/banner
+	elif [ -z "`grep /etc/banner /usr/lib/opkg/info/base-files.conffiles`" ]; then
+		echo /etc/banner >> /usr/lib/opkg/info/base-files.conffiles
+		sed -i 's|^\(.*/etc/rc.local.*\)| /etc/banner ff598dce1de580401bf2a4e1c24a4489\n\1|' /usr/lib/opkg/status
+	fi
+fi