Fix up the modification of the flimflam upstart script

mod_for_test_scripts/100setupTestingInterface

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 echo "Configuring for backchannel network device"
 
 testif=eth_test
 
 # Prevent flimflam from taking control of the backchannel network device.
 ORIG_CONF=${ROOT_FS_DIR}/etc/init/flimflam.conf
 TEMP_CONF=${ORIG_CONF}.tmp
-sed "s/flimflamd -W/flimflamd -I ${testif} -W/" ${ORIG_CONF} > ${TEMP_CONF}
+sed "s,/usr/sbin/flimflamd,/usr/sbin/flimflamd -I ${testif}," ${ORIG_CONF} > ${TEMP_CONF}
 mv -f ${TEMP_CONF} ${ORIG_CONF}
 
 # Arrange to run dhclient on the backchannel device but without
 # installing the default route, and stashing said route away for later
 # installation as a host route.
 cat > ${ROOT_FS_DIR}/etc/udev/rules.d/50-backchannel-network.rules <<EOF
 KERNEL=="eth*", SUBSYSTEMS=="usb", ACTION=="add", RUN+="/sbin/backchannel-setup %k"
 KERNEL=="${testif}", SUBSYSTEMS=="usb", ACTION=="remove", RUN+="kill \$(cat /var/run/dhclient-%k.pid)"
 EOF
 
@@ skipping 98 matching lines @@
     EXPIRE|FAIL|RELEASE|STOP)
         if [ -n "\$old_ip_address" ]; then
             # Shut down interface, which will delete routes and clear arp cache.
             ifconfig \$interface inet 0
         fi
         ;;
 esac
 EOF
 
 chmod +x ${ROOT_FS_DIR}/sbin/dhclient-backchannel-script