eden strace
eden strace

Summary:
Add an `eden strace` command that subscribes to all FUSE events for
the specified mount (or current directory), and streams them to stdout
with response latency measurements and the requesting process.

If there are any pending requests at the time `eden strace` is run,
they are printed first.

Reviewed By: wez

Differential Revision: D24038978

fbshipit-source-id: 59a2112dbdb1708571d12b04bdccaf9eca725cf7

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