37 Focus Server Cache Query: Buck healthcheck is wrong on slower networks
37 Focus Server Cache Query: Buck healthcheck is wrong on slower networks

Summary: Buck healthcheck pings measure actual network time, not how busy the app is

Test Plan:
observed the ping values while running the following command, and they were much more reasonable. And the command performed much better.

```
buck cache @/var/folders/1z/sczksp1x51908f465t1cw6c07z5lyb/T/tmpEpIZHm --output-dir /Users/skotch/.focus-out/artifacts/e7f6c9a1f10b3f8caf0862713f8519486438ca1e/FacebookWithoutExtensions-notests.iphonesimulator.x86_64.xcode_8.1.temp_buck_cache -c cache.slb_timeout_millis=9000 -v 10
```

Without these changes, it would pretty much give up after the first set of pings came in

Reviewed By: ruibm

fbshipit-source-id: a27cb0e

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