Updated openstack/openstack
Project: openstack/nova  231f6a6cd477d3bec9a2534698860ae7354304ad

Use constant for microversions header name (cleanup)

Define and use a constant for the microversion header
name rather than repeat the string literal in multiple places.

Partially implements blueprint api-microversions

Change-Id: Ief296211d5cff8b3ccfc8231cb2336582bd47ef1