Open Stack

I am working to see how we can make use of grenade to test the migration 
of neutron ml2/ovs plugin to neutron OVN plugin. OVN plugin is installed 
and configured as a devstack plugin. Since devstack has a specification 
on the phases of plugin installation, I am trying to see how it can fit 
into the existing Grenade code.
If we go with devstack's spec on plugins, it looks like we need to split 
the upgrade.sh in each project to 'install' and 'start' scripts, so that 
the plugin phases are correctly called.
Is there any other way to make it work?

Thank you,
Babu