Remove partition from log when failing to reenqueue a produce message
Remove partition from log when failing to reenqueue a produce message

The partition value is always "none" (-1) when reaching the log so it does
not add any useful info (and is misleading).

Change-Id: Iac88780bd35cc62b84c4655da678224aa7c5742e

criteo/kafka-sharp,criteo/kafka-sharp