BUG/MINOR: http-ana: Don't wait for the body of CONNECT requests

BUG/MINOR: http-ana: Don't wait for the body of CONNECT requests

CONNECT requests are bodyless messages but with no EOM blocks. Thus, conditions
to stop waiting for the message payload are not suited to this kind of
messages. Indeed, the message finishes on an EOH block. But the tunnel mode at
the stream level is only set in HTTP_XFER_BODY analyser. So, the stream is
blocked, waiting for a body that does not exist till a timeout expires.

To fix this bug, we just stop waiting for a body for CONNECT requests. Another
solution is to rely on HTX_SL_F_BODYLESS/HTTP_MSGF_BODYLESS flags. But this one
is less intrusive.

This message must be backported as far as 2.0. For the 2.0, only the HTX part
must be fixed.