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1b1ed1a
(Get the code!)
Sorry, I don't know what bits are in those Centos 7 packages, although it looks like Mitaka based on the 8.1.2 version. But I'm not sure this is a Neutron issue yet.
This could be an issue with your kernel. I know from your output that ip_nonlocal_bind is being set to 1, so arping should be able to run properly given you don't have that IP configured inside the namespace. As an experiment you could try adding another IP from that subnet manually, then try running arping for it. If that works then it's something with nonlocal-bind in your kernel.
My test system is running 4.4.0-31, but I can't say I've seen this issue before, so you might need to do some kernel debugging to figure out why it's failing. Doing 'strace arping...' might help find what the arguments are to bind() to help track that down.