Include the correct headers in various tests

Include the correct headers in various tests

Summary: There are two types of includes this adds. The first are standard library headers that weer previously included by transitive dependencies, but aren't included under MSVC, so need to be explicitly included. The second type is a couple of portability headers.

Reviewed By: yfeldblum

Differential Revision: D3513196

fbshipit-source-id: 4f2ac1207aee887ba41c19f5490003e5fe4088f4