The Google Cloud SDK (gcloud) doesn't work through Alpaca

[samuong]

Steps to reproduce:

1. Set up the proxy to go via Alpaca, by following the instructions at: https://cloud.google.com/sdk/docs/proxy-settings#proxy_configuration
2. Run gcloud compute addresses list. If you haven't already done so, it'll ask you to provide your credentials and project name.

The output should look like this:

$ gcloud compute addresses list
Listed 0 items.

But what actually happens is that it just sits there doing nothing.

[samuong]

This regression started with 42e94be.

[samuong]

Turns out this is due to the wrong newline character being used. It should be \r\n, not just \n, according to https://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2.