Update handling for EOF,ErrClosedPipe to hard return

[amilstead]

After looking at cloudflare's apt-transport that behaves very similarly it seems like a hard return is the right way to handle EOF and ErrClosedPipe errors coming from the reader.

See here: https://github.com/cloudflare/apt-transport-cloudflared/blob/8fd3a7c4318a39b24d08b0fb62ed9983e1558aea/apt/method.go#L82-L85

Somewhat related; I needed this change plus a different binary name (see here) to get this transport to work under reprepro.

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[amilstead]

CLA submitted. Sorry that wasn't done ahead of time.

[hopkiw]

/approve

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[hopkiw]

@amilstead Thanks for the PR, looks good. Can you update the tests for this change?

[amilstead]

@amilstead Thanks for the PR, looks good. Can you update the tests for this change?

Sure! Will work on that sometime this week. Thanks!

[amilstead]

Tests added-- I am by no means a go-expert, so please lmk if these tests are garbage or should be done differently.

[amilstead]

@hopkiw just nudging here. Anything else I need to do?

[amilstead]

Hi sorry, I just really don't have time to work on this. If someone else wants to pick up this PR and finish, please do.

All I can say is that this "works for me".