Auto merge of #5873 - ehuss:ws-filters, r=alexcrichton

Change target filters in workspaces.

This changes it so that filters like `--bin`, `--test`, `--example`,
`--bench`, `--lib` will work in a workspace.  Today, these filters
require that they match *every* package in a workspace which makes
them not very useful.  This change makes it so that they only must
match at least one package.

Closes #5819.