Prevent neutron-l3-agent restart killing metadata service

The existing handler which prevents keepalived from being killed
during neutron-l3-agent restarts doesn't go far enough at present.

This patch adjusts the processes which are killed to exclude the
haproxy instance which is responsible for proxying the Nova
metadata service.

Change-Id: I407c6662841bec9d3e3208d2e46bd7d1d5db00fb

handlers/main.yml

@@ -58,7 +58,7 @@
 - name: Run neutron-l3-agent process cleanup
   shell: |
     for ns_pid in $(cat /sys/fs/cgroup/pids/neutron.slice/neutron-l3-agent.service/cgroup.procs); do
-      echo $(readlink -f "/proc/$ns_pid/exe") | grep -qv "keepalived"
+      echo $(readlink -f "/proc/$ns_pid/exe") | egrep -qv "keepalived|haproxy"
       if [ $? -eq 0 ]; then
         if kill -9 "$ns_pid"; then
           logger -s "old neutron-l3-agent pid found and has been cleaned up on: \"$ns_pid\""