BUG/MINOR: mux-h1: Fix condition to set EOI on SE during zero-copy forwarding

BUG/MINOR: mux-h1: Fix condition to set EOI on SE during zero-copy forwarding

During zero-copy data forwarding, the producer must set the EOI flag on the SE
when end of the message is reached. It is already done but there is a case where
this flag is set while it should not. When a request wants to perform a protocol
upgrade and it is waiting for the server response, the flag must not be set
because the HTTP message is finished but some data are possibly still expected,
depending on the server response. On a 101-switching-protocol, more data will be
sent because the producer is switch to TUNNEL state.

So, now, the right condition is used. In DONE state, SE_FL_EOI flag is set on the sedesc iff:

  - it is the response
  - it is the request and the response is also in DONNE state
  - it is a request but no a protocol upgrade nor a CONNECT

This patch must be backported as far as 2.9.