Want these tests to run from system-tests or package root
[bug] Fix tests to reveal bug: HTTP message first line being stripped by pipeif
[bug] Partial fix for some tests -- will correctly filter requests.

Code now buffers headers in a stream buffer that is then written out at
once to the pipe. Also fixed line endings. HTTP responses still
incorrectly generated.
[bug] Passes tests again. Extended http_parser.c to report back response status lines.