REORG/MAJOR: session: rename the "session" entity to "stream"

With HTTP/2, we'll have to support multiplexed streams. A stream is in
fact the largest part of what we currently call a session, it has buffers,
logs, etc.

In order to catch any error, this commit removes any reference to the
struct session and tries to rename most "session" occurrences in function
names to "stream" and "sess" to "strm" when that's related to a session.

The files stream.{c,h} were added and session.{c,h} removed.

The session will be reintroduced later and a few parts of the stream
will progressively be moved overthere. It will more or less contain
only what we need in an embryonic session.

Sample fetch functions and converters will have to change a bit so
that they'll use an L5 (session) instead of what's currently called
"L4" which is in fact L6 for now.

Once all changes are completed, we should see approximately this :

   L7 - http_txn
   L6 - stream
   L5 - session
   L4 - connection | applet

There will be at most one http_txn per stream, and a same session will
possibly be referenced by multiple streams. A connection will point to
a session and to a stream. The session will hold all the information
we need to keep even when we don't yet have a stream.

Some more cleanup is needed because some code was already far from
being clean. The server queue management still refers to sessions at
many places while comments talk about connections. This will have to
be cleaned up once we have a server-side connection pool manager.
Stream flags "SN_*" still need to be renamed, it doesn't seem like
any of them will need to move to the session.
diff --git a/include/proto/compression.h b/include/proto/compression.h
index e5ae8b6..5c7c8cb 100644
--- a/include/proto/compression.h
+++ b/include/proto/compression.h
@@ -31,9 +31,9 @@
 int comp_append_algo(struct comp *comp, const char *algo);
 
 int http_emit_chunk_size(char *end, unsigned int chksz);
-int http_compression_buffer_init(struct session *s, struct buffer *in, struct buffer *out);
-int http_compression_buffer_add_data(struct session *s, struct buffer *in, struct buffer *out);
-int http_compression_buffer_end(struct session *s, struct buffer **in, struct buffer **out, int end);
+int http_compression_buffer_init(struct stream *s, struct buffer *in, struct buffer *out);
+int http_compression_buffer_add_data(struct stream *s, struct buffer *in, struct buffer *out);
+int http_compression_buffer_end(struct stream *s, struct buffer **in, struct buffer **out, int end);
 
 #ifdef USE_ZLIB
 extern long zlib_used_memory;