Return of TotalConnections and TotalCommands

The number of processed commands and the count of connections made are not available as plain integer values anymore, only in as strings in a more general info string. This PR re-introduces them.


I used them in https://github.com/alicebob/miniredis/blob/master/miniredis.go#L186 and https://github.com/alicebob/miniredis/blob/master/miniredis.go#L202