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There was a change introduced to nova in newton which requires a minimum 
of netaddr 0.7.13. We've been testing with 0.7.18 from upper-constraints 
so bumping the minimum from 0.7.12 to 0.7.13 shouldn't cause any issues.

The g-r change is here:

https://review.openstack.org/#/c/370833/

We're not going to revert the nova change since that would be riskier at 
this point in the cycle since it landed before n-2.

-- 

Thanks,

Matt Riedemann