swift 2.17.0 release

meta:version: 2.17.0
meta:diff-start: -
meta:series: queens
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: John Dickinson <me@not.mn>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: I0eec590c329a43d4f1243a4aeee3de8a0626dd53
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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