Create a new file /etc/init.d/sendsignals containing the following:
cat > sendsignals << "EOF"
#!/bin/sh
# Begin /etc/init.d/sendsignals
#
# Include the functions declared in the /etc/init.d/functions file
#
source /etc/init.d/functions
#
# Send all the remaining processes the TERM signal
#
echo -n "Sending all processes the TERM signal..."
/sbin/killall5 -15
evaluate_retval
#
# Send all the remaining process (after sending them the TERM signal
# before) the KILL signal.
#
echo -n "Sending all processes the KILL signal..."
/sbin/killall5 -9
evaluate_retval
# End /etc/init.d/sendsignals
EOF