Feng Shengqin 20ca8186c6 Introduce API micro version
The patch adds 'OpenStack-API-Version' header for each requests.

Change-Id: I621a4268685a1c188a004dcfa576775b424d2610
Implements: blueprint api-microversion
2017-04-27 08:46:38 +08:00
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2017-04-27 08:46:38 +08:00