BUG/MAJOR: session: revert all the crappy client-side timeout changes

This is the 3rd regression caused by the changes below. The latest to
date was reported by Finn Arne Gangstad. If a server responds with no
content-length and the client's FIN is never received, either we leak
the client-side FD or we spin at 100% CPU if timeout client-fin is set.

Enough is enough. The amount of tricks needed to cover these side-effects
starts to look like used toilet paper stacked over a chocolate cake. I
don't want to eat that cake anymore!

All this to avoid reporting a server-side timeout when a client stops
uploading data and haproxy expires faster than the server... A lot of
"ifs" resulting in a technically valid log that doesn't always please
users, and whose alternative causes that many issues for all others

So let's revert this crap merged since 1.5-dev25 :
  Revert "CLEANUP: http: don't clear CF_READ_NOEXP twice"
    This reverts commit 1592d1e72a4a2d25a554c299ae95a3e6cad80bf1.
  Revert "BUG/MEDIUM: http: clear CF_READ_NOEXP when preparing a new transaction"
    This reverts commit 77d29029af1c44216b190dd7442964b9d8f45257.
  Revert "BUG/MEDIUM: session: don't clear CF_READ_NOEXP if analysers are not called"
    This reverts commit 0943757a2144761c60e416b5ed07baa76934f5a4.
  Revert "BUG/MEDIUM: http: disable server-side expiration until client has sent the body"
    This reverts commit 3bed5e9337fd6eeab0f0006ebefcbe98ee5c4f9f.
  Revert "BUG/MEDIUM: http: correctly report request body timeouts"
    This reverts commit b9edf8fbecc9d1b5c82794735adcc367a80a4ae2.
  Revert "BUG/MEDIUM: http/session: disable client-side expiration only after body"
    This reverts commit b1982e27aaff2a92a389a9f1bc847e3bb8fdb4f2.

If a cleaner AND SAFER way to do something equivalent in 1.6-dev, we *might*
consider backporting it to 1.5, but given the vicious bugs that have surfaced
since, I doubt it will happen any time soon.

Fortunately, that crap never made it into 1.4 so no backport is needed.
(cherry picked from commit 6f0a7bac282c9b2082dc763977b7721b6b002089)
2 files changed