CNI >= 1.0.0 only allows for the plugin list configuration format, which currently the OVN-K implementation does not allow (i.e. it only understands a single configuration).

We should allow for this configuration type, but return an error if a CNI chain (i.e. more than one plugin) is provisioned.

Definition of done:

• this failing unit test should pass.
• a negative unit test should be added: an error should be thrown is a CNI chain is passed.