Fix compacted topic processor test

* Use buffered producer on compacted topic processor test

* Add include directives for callback invoker where missing

* Consume until EOF on compacted topic processor test

include/cppkafka/utils/backoff_committer.h

@@ -36,6 +36,7 @@
 #include <string>
 #include "../consumer.h"
 #include "backoff_performer.h"
+#include "../detail/callback_invoker.h"
 
 namespace cppkafka {
 

include/cppkafka/utils/buffered_producer.h

@@ -42,6 +42,7 @@
 #include <boost/optional.hpp>
 #include "../producer.h"
 #include "../message.h"
+#include "../detail/callback_invoker.h"
 
 namespace cppkafka {