protected String extractScheme(ToolOptions options, DataSourceType dsType) {
        return SupportedManagers.extractScheme(options, dsType);
    }
Instantiate a ConnManager that can fulfill the database connection
requirements of the task specified in the JobData.

@param options the user-provided arguments that configure this
               Sqoop job.
@return a ConnManager that can connect to the specified database
and perform the operations required, or null if this factory cannot
find a suitable ConnManager implementation.
src/main/java/org/replicadb/manager/ManagerFactory.java