cql3: allow IN restriction only on last restricted column

2.2 allows IN on any column and it seems that we support that fine, but
DTESTs except us to reject such queries.

Signed-off-by: Paweł Dziepak <pdziepak@cloudius-systems.com>

cql3/restrictions/single_column_primary_key_restrictions.hh

@@ -99,6 +99,11 @@ public:
                         _restrictions->next_column(new_column)->name_as_text(), new_column.name_as_text()));
                 }
             }
+
+            if (_in && _schema->position(new_column) > _schema->position(last_column)) {
+                throw exceptions::invalid_request_exception(sprint("Clustering column \"%s\" cannot be restricted by an IN relation",
+                    new_column.name_as_text()));
+            }
         }
 
         _slice |= restriction->is_slice();