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fix(ls): show relative paths from root

Change the output in `npm ls` for symlink dependencies (including
workspaces) to show the relative path from the project root, rather than
the absolute path of the link target.

This makes the output much less noisy and more ergonomic when many
workspaces and link dependencies are in use, especially when paths are
long.

It is arguable that this output might be slightly misleading, since the
_actual_ workspace symlink from `${root}/node_modules/b` to
`${root}/packages/b` has a link value of `../packages/b`, not just
`packages/b`.  (Or on Windows, always the full absolute path, because
junctions.)  Thus, `npm ls b` will not show the same output as `ls -l
node_modules/b`.

However, `npm ls` shows the logical tree, not the physical tree, so
presenting the user with a path that they can use and interpret is more
important than presenting them with the strictly accurate details of
their filesystem.

PR-URL: https://github.com/npm/cli/pull/3272
Credit: @isaacs
Close: #3272
Reviewed-by: @darcyclarke

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