[MINOR] stick-table: provide a table lookup function

We'll often need to lookup a table by its name. This will change
in the future once we can resolve these names on startup.
diff --git a/include/proto/stick_table.h b/include/proto/stick_table.h
index 813b3b9..38ec9ae 100644
--- a/include/proto/stick_table.h
+++ b/include/proto/stick_table.h
@@ -46,6 +46,7 @@
 					unsigned long table_type);
 int stktable_compatible_pattern(struct pattern_expr *expr, unsigned long table_type);
 int stktable_get_data_type(char *name);
+struct proxy *find_stktable(const char *name);
 
 /* reserve some space for data type <type>. Return non-0 if OK, or 0 if already
  * allocated (or impossible type).
diff --git a/src/stick_table.c b/src/stick_table.c
index f490384..a5e41bf 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -544,3 +544,14 @@
 	return -1;
 }
 
+/* Returns pointer to proxy containing table <name> or NULL if not found */
+struct proxy *find_stktable(const char *name)
+{
+	struct proxy *px;
+
+	for (px = proxy; px; px = px->next) {
+		if (px->table.size && strcmp(px->id, name) == 0)
+			return px;
+	}
+	return NULL;
+}