logger: fix debug logs' formatting directives
logger: fix debug logs' formatting directives

Default DebugLogger had broken Printf directives -
for DebugLogger.Printf(fmt,A,B,C) it called Logger.Printf(fmt,[A B C]),
which resulted in logs like
```
client/coordinator coordinator for consumergroup [topicname
%!s(int32=1) host:9094] is #%!d(MISSING) (%!s(MISSING))
```

This commit fixes value passing for Printf.

Shopify/sarama,DataDog/sarama,Shopify/sarama,DataDog/sarama