Fixes:ISSU vrouter agent sometims in init state after ISSU migrate / …

…rollback

Description: stopping supervisor-vrouter is needed to remove vrouter module. But stopping supervisor-vrouter might take some time, which is causing a failure in rmmod of vrouter, as vrouter is still in use by contrail-vrouter-agent. With -w option, rmmod will wait till vrouter module is not in use before it is removed.
Closes-Bug:1680653

Change-Id: If53da17cdca420cc70ed6ba7f9a8396397c3d735

src/config/utils/issu_process.sh

@@ -7,7 +7,7 @@ function issu_contrail_switch_compute_node {
     openstack-config --set /etc/contrail/supervisord_vrouter_files/contrail-vrouter-agent.ini program:contrail-vrouter-agent killasgroup true
     openstack-config --set /etc/contrail/contrail-vrouter-nodemgr.conf DISCOVERY server $1 
     for i in `ls /etc/contrail/contrail-tor-agent-*`; do echo $i; openstack-config --set $i DISCOVERY server $1; done
-    service supervisor-vrouter stop; rmmod vrouter;modprobe vrouter;service supervisor-vrouter start
+    service supervisor-vrouter status; service supervisor-vrouter stop; service supervisor-vrouter status; rmmod -w vrouter;modprobe vrouter;service supervisor-vrouter start
     contrail-status
     route -n
 }