Looking at the kamino.log after trying to display ressources show no such messages. I see the process where VSC looks at the available ressources (interfaces, vols, aggrs). It evens show an ifconfig and vif summary, so it does see the interfaces, but does not considers them as "avaible" ressources for the provisioning module.
It looks like you are running a version of ONTAP that supports concurrent system-cli. The logs show that the system-cli call we use to build the interface details returns an invalid return code. This is causing the error you are seeing.
Running the same 184.108.40.206P4 release (with VSC 2.1.1 on vSphere 5) and I've exactly the same problem (no interface shown and impossibility to provision datastore). I've 6 storage with the same 220.127.116.11P4 release on them should I upgrade all of them (really difficult because I've to plan a full stop of the datacenter to do this or there will be a patch available that will solve the problem with VSC ? Should I open a support call?