BUG/MINOR: lua: Bad HTTP client request duration.

BUG/MINOR: lua: Bad HTTP client request duration.

HTTP LUA applet callback should not update the date on which the HTTP client requests
arrive. This was done just after the LUA applet has completed its job.

This patch simply removes the affected statement. The same fixe has been applied
to TCP LUA applet callback.

To reproduce this issue, as reported by Patrick Hemmer, implement an HTTP LUA applet
which sleeps a bit before replying:

  core.register_service("foo", "http", function(applet)
      core.msleep(100)
      applet:set_status(200)
      applet:start_response()
  end)

This had as a consequence to log %TR field with approximatively the same value as
the LUA sleep time.

Thank you to Patrick Hemmer for having reported this issue.

Must be backported to 1.8, 1.7 and 1.6.