existing process using port breaks when username is `cwd`

Created by: chrisdrackett

I feel like this is a regression, but I could be wrong. Because my username is cwd the command to get the process on port 3000 (https://github.com/facebookincubator/create-react-app/blob/05c3b55c62e5b5159382a024c21aa3527c95f1af/packages/react-dev-utils/getProcessForPort.js#L46) ends up spiting out quite a lot of data. While I understand why this is the case, I feel like this command used to work? Did it not used to search for cwd?