neutron/releasenotes/notes/bug-1986003-9bf5ca04f930433...

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fixes:
- |
`1986003 <https://bugs.launchpad.net/neutron/+bug/1986003>`_
Fixed an issue with concurrent requests to activate the same port binding
where one of the requests returned a 500 Internal Server Error.
With the fix one request will return successfully and the other will
return a 409 Conflict (Binding already active).
This fixes errors in nova live-migrations where those concurrent requests
might be sent. Nova handles the 409/Conflict response gracefully.