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A GET request from the os-virtual-interfaces API returns a 500 today if 
neutron is the networking backend.

It would be more accurate to return a 501, but do we need a microversion 
for that?

I intend on implementing the method for the neutronv2 API in nova [1] 
but it will require a microversion and until then, I was thinking it 
should return a 501 rather than a 500 but don't want to go through the 
paperwork if that requires a microversion.

[1] https://review.openstack.org/#/c/288965/

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Thanks,

Matt Riedemann