Sync request_id middleware bug fix from oslo

There is a bug in request-id middleware that a subsequent API request
will overwrite a request-id of a previous request when multiple API
calls are processed in parallel in request_id middleware. This problem
was discovered when implementing nova change I5e370. Syncing the update
will allow that change to move forward.

oslo change to fix the middleware:
d7bd9dc37ac3d6bc171cd2e290c772633ad20a32

Change-Id: Ie7d8e831c43b9b246a30cef9a44a9e8a31ebe420
Merge "Sync request_id middleware bug fix from oslo"