Many sharding command classes override the `ErrmsgCommandDeprecated::errmsgRun` function which takes in a db string instead of a `DatabaseName` object. In the call site of this function, the code serializes a `DatabaseName` object to string. Soon after this, in the override function of some classes, the string is deserialized back to a `DatabaseName` object. It wastes the time. 

In this ticket,  we will change the function definition to take in `DatabaseName` object.