Neutron OCF scripts should use neutron agent-list to check status

[Miroslav Anashkin]

We have cases when Neutron agent managed by Pacemaker was reported by `neutron agent-list` as dead but Pacemaker considered it as alive.
This happens when agent process exists and get stalled, for instance, due to Oslo messaging bug.
Built-in Neutron heartbeat functionality detects such agents as dead correctly.

[Matthew Mosesohn (raytrac3r)]

This is a bugfix team bug. Sorry, Alexey

[Eugene Nikanorov (enikanorov)]

This _must_ not be addressed.

Any kind of possible fix will do much more harm than good.
While neutron agent-list is a good way to tell if neutron-server should keep resources on particular agent (like DHCP or L3), it absolutely can't be a basis for decision of agent restart.

The roots of this bug is oslo.messaging issue where agents stopped communicating via RPC until restart.
The problem is not specific to neutron agents (nova, cinder services are affected too).
Adding protection from such kind of bugs, especially a kind of protection which can be buggy in the similar way is plain wrong both from theoretical and practical point of view.

[Bogdan Dobrelya (bogdando)]

I agree with Eugene

[Matthew Mosesohn (raytrac3r)]

If both Eugene and Bogdan agree that this is a bad fix, I'm afraid I will have to side with them. Let's leave this as-is