CLEANUP: session: move the stick counters declarations to stick_table.h

They're really not appropriate in session.h as they always require a
stick table, and I'm having a hard time finding them each time I need
to.
diff --git a/include/types/session.h b/include/types/session.h
index 02772a8..f17aff4 100644
--- a/include/types/session.h
+++ b/include/types/session.h
@@ -91,20 +91,6 @@
 #define SN_COMP_READY   0x00100000	/* the compression is initialized */
 #define SN_SRV_REUSED   0x00200000	/* the server-side connection was reused */
 
-/* WARNING: if new fields are added, they must be initialized in session_accept()
- * and freed in session_free() !
- */
-
-#define STKCTR_TRACK_BACKEND 1
-#define STKCTR_TRACK_CONTENT 2
-/* stick counter. The <entry> member is a composite address (caddr) made of a
- * pointer to an stksess struct, and two flags among STKCTR_TRACK_* above.
- */
-struct stkctr {
-	unsigned long   entry;          /* entry containing counters currently being tracked by this session  */
-	struct stktable *table;         /* table the counters above belong to (undefined if counters are null) */
-};
-
 /*
  * Note: some session flags have dependencies :
  *  - SN_DIRECT cannot exist without SN_ASSIGNED, because a server is
@@ -171,16 +157,6 @@
 	char *unique_id;			/* custom unique ID */
 };
 
-/* parameters to configure tracked counters */
-struct track_ctr_prm {
-	struct sample_expr *expr;		/* expression used as the key */
-	union {
-		struct stktable *t;		/* a pointer to the table */
-		char *n;			/* or its name during parsing. */
-	} table;
-};
-
-
 #endif /* _TYPES_SESSION_H */
 
 /*
diff --git a/include/types/stick_table.h b/include/types/stick_table.h
index 6fdc58e..0cda104 100644
--- a/include/types/stick_table.h
+++ b/include/types/stick_table.h
@@ -193,4 +193,27 @@
 	union stktable_key_data data;   /* data, must always be last */
 };
 
+/* WARNING: if new fields are added, they must be initialized in session_accept()
+ * and freed in session_free() !
+ */
+#define STKCTR_TRACK_BACKEND 1
+#define STKCTR_TRACK_CONTENT 2
+
+/* stick counter. The <entry> member is a composite address (caddr) made of a
+ * pointer to an stksess struct, and two flags among STKCTR_TRACK_* above.
+ */
+struct stkctr {
+	unsigned long   entry;          /* entry containing counters currently being tracked by this session  */
+	struct stktable *table;         /* table the counters above belong to (undefined if counters are null) */
+};
+
+/* parameters to configure tracked counters */
+struct track_ctr_prm {
+	struct sample_expr *expr;		/* expression used as the key */
+	union {
+		struct stktable *t;		/* a pointer to the table */
+		char *n;			/* or its name during parsing. */
+	} table;
+};
+
 #endif /* _TYPES_STICK_TABLE_H */