Add support for new yarn workspaces config format

[detrohutt]

Description

Use the new workspaces.packages key in package.json when available. Otherwise fall back to current behavior.

Motivation and Context

This allows use of yarn's new nohoist feature

How Has This Been Tested?

My current project has the following relevant versions:

• node@9.5.0
• yarn@1.4.1-20180208.2355 (nightly)
• lerna@2.8.0 (with my patch)

I've only had time to test this manually in my current project. Here's what happened.

1. I enabled and used the nohoist feature. For more detail on how I did this see my PR to create-react-app

2. At this point, lerna run start failed with:

EPACKAGES Errored while collecting packages and package graph
TypeError: packageConfigs.some is not a function

3. I applied this patch. The error went away and everything worked as expected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[evocateur]

Thanks!

[lock]

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