Tim Burke 60a2fe0ba8 Use separate headers for versioned_writes' stack and history modes
Now, instead of saying

   X-Versions-Location: <container>
   X-Versions-Mode: history

clients should just say

   X-History-Location: <container>

Since we've never had a release featuring a user-settable
X-Versions-Mode header, support may be dropped and that is now ignored.

Change-Id: Icfd0f481d4e40dd5375c737190aea7ee8dbc3bf9
2016-09-21 16:42:27 -07:00
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