Improve support for interface sysctls

patches/openwrt/0004-package-base-files-change-sysctl-handling.patch

+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Sat, 11 Jan 2014 13:31:13 +0100
+Subject: package/base-files: change sysctl handling
+
+Move /etc/init.d/sysctl to index 00 and add hotplug script that applies
+interface specific sysctls for interfaces that only appear later - this
+allows to reliably configure per-interface parameters in sysctl.conf, e.g.
+to disable ipv6 autoconfig on a specific iface.
+
+Cherry-picked from Barrier Breaker
+
+diff --git a/package/base-files/files/etc/hotplug.d/net/00-sysctl b/package/base-files/files/etc/hotplug.d/net/00-sysctl
+new file mode 100644
+index 0000000..5d9da8a
+--- /dev/null
++++ b/package/base-files/files/etc/hotplug.d/net/00-sysctl
+@@ -0,0 +1,6 @@
++#!/bin/sh
++
++if [ -f /etc/sysctl.conf ] && [ "$ACTION" = add ]; then
++	sed -ne "/^[[:space:]]*net\..*\.$DEVICENAME\./p" /etc/sysctl.conf | \
++		sysctl -e -p - | logger -t sysctl
++fi
+diff --git a/package/base-files/files/etc/init.d/sysctl b/package/base-files/files/etc/init.d/sysctl
+index 3480d66..beeb79f 100755
+--- a/package/base-files/files/etc/init.d/sysctl
++++ b/package/base-files/files/etc/init.d/sysctl
+@@ -1,7 +1,7 @@
+ #!/bin/sh /etc/rc.common
+ # Copyright (C) 2006 OpenWrt.org 
+ 
+-START=11
++START=0
+ start() {
+ 	[ -f /etc/sysctl.conf ] && sysctl -p -e >&-
+ }