MINOR: proto_htx: Add some functions to handle HTX messages

More functions will come, but it is the minimum to switch HTX analyzers on the
HTX internal representation.
diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index 6c84f35..54169a1 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -53,6 +53,8 @@
 void http_txn_reset_res(struct http_txn *txn);
 
 /* Export HTX analyzers and helpers */
+// FIXME: Rename all these functions http_* once legacy code will be removed
+
 int htx_wait_for_request(struct stream *s, struct channel *req, int an_bit);
 int htx_process_req_common(struct stream *s, struct channel *req, int an_bit, struct proxy *px);
 int htx_process_request(struct stream *s, struct channel *req, int an_bit);
@@ -63,8 +65,11 @@
 int htx_process_res_common(struct stream *s, struct channel *rep, int an_bit, struct proxy *px);
 int htx_request_forward_body(struct stream *s, struct channel *req, int an_bit);
 int htx_response_forward_body(struct stream *s, struct channel *res, int an_bit);
-void htx_adjust_conn_mode(struct stream *s, struct http_txn *txn, struct http_msg *msg);
+void htx_adjust_conn_mode(struct stream *s, struct http_txn *txn);
 int htx_apply_redirect_rule(struct redirect_rule *rule, struct stream *s, struct http_txn *txn);
+void htx_server_error(struct stream *s, struct stream_interface *si, int err, int finst, const struct buffer *msg);
+void htx_reply_and_close(struct stream *s, short status, struct buffer *msg);
+
 
 void debug_hdr(const char *dir, struct stream *s, const char *start, const char *end);
 int apply_filter_to_req_headers(struct stream *s, struct channel *req, struct hdr_exp *exp);