move wangle/futures to futures
Summary:
First step of moving futures out of wangle into folly
Namespace change will be another diff
This was just a straight codemod of "wangle/futures" to "futures"
Test Plan: wait for contbuild
Reviewed By: davejwatson@fb.com
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FB internal diff:
D1772041
Tasks:
5960242
Signature: t1:
1772041:
1420739169:
36126b1264c5d1747d241921d02b13e306c73fe1