yarn install fails with `ENOENT: no such file or directory` occasionally

Running `yarn install` as part of a build step for a [Docker image](https://github.com/NiGhTTraX/react-test-buffet/blob/85749bb75e7d7ada08419eff377b0f02e88a94dd/Dockerfile#L1) based on `node:7` [fails on Travis CI](https://travis-ci.org/NiGhTTraX/react-test-buffet/builds/198314605#L384) with `ENOTEMPTY`, `EEXISTS` errors. It always seems to error on the `webdriverio` package.



```

yarn install v0.19.1

[1/4] Resolving packages...

[2/4] Fetching packages...

error An unexpected error occurred: "https://registry.yarnpkg.com/webdriverio/-/webdriverio-4.6.2.tgz: ENOENT: no such file or directory, open '/usr/local/share/.cache/yarn/npm-webdriverio-4.6.2-dd095ee618896a21c8f1b9d4278736d85a64ca0f/lib/protocol/timeouts.js'".

```



When Travis runs `yarn install` as part of the install phase it [works just fine](https://travis-ci.org/NiGhTTraX/react-test-buffet/builds/198314605#L253). The error only happens when building a Docker image.



[Repo](https://github.com/NiGhTTraX/react-test-buffet/tree/85749bb75e7d7ada08419eff377b0f02e88a94dd) which reproduces this issue.



node:7

OS: Docker + Travis CI

yarn: 0.19.1

[package.json](https://github.com/NiGhTTraX/react-test-buffet/blob/85749bb75e7d7ada08419eff377b0f02e88a94dd/package.json)

[yarn.lock](https://github.com/NiGhTTraX/react-test-buffet/blob/85749bb75e7d7ada08419eff377b0f02e88a94dd/yarn.lock)



I've tried installing yarn both with `npm install -g` and with `apt` and both methods cause the failure on Travis.



Weirdly enough, the image builds successfully on my local machine which runs Ubuntu 16.04.1 LTS with Docker version 1.13.0, build 49bf474.

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