Creating a networking resource should fail when opendaylight controller is down

[Itzik Brown]

When OpenDaylight is down a networking resource creation (as well as other actions) is successful so there is no indication that something is wrong.

Network creation (As well as other actions should fail when OpenDaylight controller is down.

Version
=======
python-networking-odl-3.2.0-2.el7ost.noarch
opendaylight-5.2.0-2.el7ost.noarch

How to reproduce
================
1. Shut down the OpenDaylight controller
2. Create a network
   $ neutron net-create net1
3. Verify the command is successful.

[ofer blaut (oblaut)]

I think that when Neutron is working with ODL, when ODL server is down, each neutron operation should fail, not just network creation

[Isaku Yamahata (yamahata)]

Neutron semantics is, if neutron resource(network, subnet, port ...) is created, eventually it will be configured on physical network.

Probably it is better to have a way to get ODL status via neutron rest api. But it's another story.