End request, status, header, and trailer lines with CRLF

[DemiMarie]

Feature Overview

Send requests and responses to NGINX that use CRLF as the line ending, rather than bare LF. If handling of bare LF needs to be considered, move that to separate tests.

Alternatives Considered

Continue the current behavior where some tests use CRLF (correct) and others use bare LF (wrong).

Additional Context

I patched NGINX to reject bare LF and a lot of unrelated tests failed.