Change format of Info log message
Change format of Info log message

We currently have an issue with kibana where for some messages
the labels are not correctly parsed, and they are considered part
of the message. This messes up with getting logs easily.

I am trying to change this message to see if it fixes the issue.

Change-Id: I45a24df49a1d564a4c8a8dd0453d1fd72a5cc237

criteo/kafka-sharp,criteo/kafka-sharp