MINOR: http: add full-length header fetch methods

MINOR: http: add full-length header fetch methods

The req.hdr and res.hdr fetch methods do not work well on headers which
are allowed to contain commas, such as User-Agent, Date or Expires.
More specifically, full-length matching is impossible if a comma is
present.

This patch introduces 4 new fetch functions which are designed to work
with these full-length headers :
  - req.fhdr, req.fhdr_cnt
  - res.fhdr, res.fhdr_cnt

These ones do not stop at commas and permit to return full-length header
values.