Brian Goff 01034af976 getPids - don't recursively traverse every dir ...

`filepath.Walk` recursively traverses every dir, which is not what is
needed for getPids.
Instead only read the list of dirs in the top level of `/proc`.

```
benchmark              old ns/op     new ns/op     delta
BenchmarkGetPids-4     868684        195522        -77.49%
```

2018-07-19 09:42:52 -07:00

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