swift 2.17.1 release

meta:version: 2.17.1
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: John Dickinson <me@not.mn>
meta:release:Change-Id: I6df86c86523d3b4d5d6d9010a600f5d366bbf80f
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+2: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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