MXS-1645: mxs_adapter could parse the entire database or instance

Created under the MaxScale project as MXS-1645 by wjf870128.

Original Description

I have used the mxs_adapter to retore the data which is parsed by avrorouter into columnstore.
I found that the mxs_adapter only catch one table into columnstore at only one process.
Could you develop a new feature that mxs_adapter could catch the avro data from one maxscale instance binlogserver and retore into the columntore at instance level ,not table level?
Thanks very much.