build: deprecate link all behavior

[Esemesek]

Deprecate react-native link without specifying packageName.

Tests:

1. Init new project with react-native init $project_name
2. Install a couple of native dependencies that need to be linked
3. Invoke link command

node path/to/cli/packages/local-cli/cli.js link

Modules are linked correctly but we get deprecation notice.

[grabbou]

Thanks for working on this feature! Just a small comment on the deprecation message itself and this is ready to go!

[grabbou]

BTW - we really need a proper logger!

[grabbou]

Fixed one thing and added URL to an issue where users will be able to let us know about the deprecation.

[grabbou]

Approving the original PR. Waiting for @Esemesek to approve my changes that landed in the last commit and this is ready to go.