Switch the watchman cursor to clock_id
Switch the watchman cursor to clock_id

Summary: Buck interacts watchman via a cursor: either a named one that is automatically updated, or a logical clock_id. In theory, switching from named to clock_id is a no-op.

Test Plan: Run tests, change files, ensure we see the right number of files have changed. Also unit tests in DaemonIntegrationTest

Reviewed By: yiding

fbshipit-source-id: 0c1f94e

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