Disallow caching local modules

[kripod]

Do you want to request a feature or report a bug?
Report a bug

What is the current behavior?
Modules specified by a local path in package.json get cached.

If the current behavior is a bug, please provide the steps to reproduce.

1. Run yarn install from the directory of a qualifying package.json file
2. Change the source file(s) of the locally specified package
3. Run yarn install from the same directory as in step 1

What is the expected behavior?
Local modules shall not be cached, but installed straight from their given path.

Please mention your node.js, yarn and operating system version.
Node.js: v7.3.0
Yarn: v0.18.1
OS: Win10 x64

[eTorAken]

Seems to be a duplicate of #2165.

[kripod]

@eTorAken Sorry, I was searching but could not find that specific issue about the case. I'm closing this to move further conversation over #2165.