Deprecating RequestParams::getThreadManager()
Deprecating RequestParams::getThreadManager()

Summary: The purpose of this diff is to identify any locations where an actual concurrency::ThreadManager is required by a caller to RequestParams::getThreadManager - because those will initially be incompatible with resource pools. Most users of getThreadManager only really need the folly::Executor interface.

Reviewed By: ycking21

Differential Revision: D35408333

fbshipit-source-id: 4796c1524f29e66ea82cc2d7ed73e8288026b74e

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