useBulkStmts compatibility value with pre 3.2 version

Creation of option `useBulkStmtsForInserts` in 3.2 makes an incompatibility with previous versions that where explicitly disabling option `useBulkStmts`, since default of option `useBulkStmtsForInserts` is true.

To avoid this incompatibility, explicit disabling `useBulkStmts` option must be considered as disabling useBulkStmtsForInserts as well.