move wangle/Executor.h to folly/ root
Summary:
this removes the dep EventBase has on wangle as we prepare to split off wangle
also changes namespace from folly::wangle to folly
Test Plan: just a couple of codemods so waiting for contbuild
Reviewed By: davejwatson@fb.com
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FB internal diff:
D1737376
Tasks:
5802833
Signature: t1:
1737376:
1418423430:
82d219c34fcc50218c380a17435e5880e53db6bd