Make responses to info and replag command more consistent

* Always show [input: section] or (if input is section) just [input].

* Always show the related/mapped data in the response.
  For example, the following is now the output:

  @info <dbhost>
  > [<dbhost>: <section>] <ip>

  @replag <dbhost>
  > [<dbhost>: <section>] <ip>: <replag>s

* Show which dbname was used to get the replag from a section