Cpimport logging to binary logs

Additional option for cpimport for writing imports into binlog.

At the moment cpimport don't write into binlog.

As a requirement for a hotbackup like mysqldump --single-transaction
cpimport should able to write into binlog.

It is likely, that this option has a performance impact, so it should be optional and can be changed with a new option for cpimport and/or an additional variable.