Missing DELETE operation in COM_STMT_BULK_STMT

Current Bulk command (COM_STMT_BULK_STMT) permit insert, update, but not DELETE operations.

That is a pain because for JDBC, API permit to indicate if the query will have a resultset or not.
I don't see any reason for not permitting it.
One advantage is having only one OK_Packet as a results compared to sending lots of queries with each one having an OK_Packet

Change is just setting a flag to permit this kind of operation.
The current result is an error "This command is not supported in the prepared statement protocol yet"