[#269] netmap: Support non-ascii attributes in SELECT IN

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

netmap/parser/Query.g4

@@ -20,7 +20,7 @@ cbfStmt: CBF BackupFactor = NUMBER1; // container backup factor
 
 selectStmt:
     SELECT Count = NUMBER1           // number of nodes to select without container backup factor *)
-    (IN clause? Bucket = ident)? // bucket name
+    (IN clause? Bucket = filterKey)? // bucket name
     FROM Filter = identWC            // filter reference or whole netmap
     (AS Name = ident)?               // optional selector name
     ;