Reduce Log-Level for send2server updates

[cratoo]

Currently in lib/client.js line 83, for each and every update a line is added to the log with level info.

 adapter.log.info(`send2Server ${id}[${topic}]`);

If you deal with data that gets updated every second, this can really get messy in the log.
From my point of view this should be changed to debug level.

Another way would be to add an option to disable update information in the log.