[CLEANUP] move remaining stats sockets code to dumpstats

The remains of the stats socket code has nothing to do in proto_uxst
anymore and must move to dumpstats. The code is much cleaner and more
structured. It was also an opportunity to rename AN_REQ_UNIX_STATS
as AN_REQ_STATS_SOCK as the stats socket is no longer unix-specific
either.

The last item refering to stats in proto_uxst is the setting of the
task's nice value which should in fact come from the listener.
diff --git a/include/proto/dumpstats.h b/include/proto/dumpstats.h
index 844879a..a0167a7 100644
--- a/include/proto/dumpstats.h
+++ b/include/proto/dumpstats.h
@@ -44,6 +44,8 @@
 #define STATS_ST_REP   2
 #define STATS_ST_CLOSE 3
 
+int stats_sock_parse_request(struct session *s, char *line);
+int stats_sock_req_analyser(struct session *s, struct buffer *req, int an_bit);
 int stats_dump_raw(struct session *s, struct buffer *rep, struct uri_auth *uri);
 void stats_dump_raw_to_buffer(struct session *s, struct buffer *req);
 int stats_dump_http(struct session *s, struct buffer *rep, struct uri_auth *uri);