Development server reports boot too early

[Timer]

Bug report

Describe the bug

❯ yarn next dev examples/z-experimental-refresh/
yarn run v1.22.4
$ node --trace-deprecation packages/next/dist/bin/next dev examples/z-experimental-refresh/
ready - started server on http://localhost:3000
Port 3000 is already in use.
Use `npm run dev -- -p <some other port>`.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

To Reproduce

Run a Next.js app on a port that is already in use.

Expected behavior

❯ yarn next dev examples/z-experimental-refresh/                                                                                                                                     ✘ 1 
yarn run v1.22.4
$ node --trace-deprecation packages/next/dist/bin/next dev examples/z-experimental-refresh/
Port 3000 is already in use.
Use `npm run dev -- -p <some other port>`.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[balazsorban44]

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