Summary:
Trying to cleanup top-level folders.
This moves chef under the tools directory.

Test Plan: N/A

Reviewers: michelle, vihang, #third_party_approvers

Reviewed By: vihang, #third_party_approvers

Differential Revision: https://phab.corp.pixielabs.ai/D8133

GitOrigin-RevId: 231419eb22fc42c03752cadcf7ed19e15109cc51