configs/buildroot: remove ifplugd

We don't use ifplugd since Feb 2014. See the commit:
162fb24e

 userspace: run dhcpc in background forever, not through auto means

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

configs/buildroot/wrs_release_br2_config

@@ -2156,7 +2156,7 @@ BR2_PACKAGE_ETHTOOL=y
 #
 # ibrdtnd needs a toolchain w/ C++, threads
 #
-BR2_PACKAGE_IFPLUGD=y
+# BR2_PACKAGE_IFPLUGD is not set
 # BR2_PACKAGE_IFTOP is not set
 
 #

userspace/rootfs_override/etc/ifplugd/ifplugd.action

-#!/bin/sh
-# $Id: ifplugd.action 99 2004-02-08 20:17:59Z lennart $
-
-# This file is part of ifplugd.
-#
-# ifplugd is free software; you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your
-# option) any later version.
-#
-# ifplugd is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-# for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with ifplugd; if not, write to the Free Software Foundation,
-# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
-
-set -e
-
-## NOTE: wr-switch-sw doesn't run ifplugd by default any more
-if [ -z "$1" ] || [ -z "$2" ] ; then
-	echo "Wrong arguments" > /dev/stderr
-	exit 1
-fi
-
-[ "$2" = "up" ]; then
-   exec /sbin/udhcpc -n $1
-fi
-if [ "$2" = "down" ]; then
-  killall udhcpc
-  exit 0
-fi
-
-exit 1

userspace/rootfs_override/etc/ifplugd/ifplugd.conf

-# our ifplugd (0.28) is not reading this file, so force it
-# empty in WR switch to avoid getting mad in tracking its use
-