Make get_metadata(Topic) return only topic metadata

include/cppkafka/message.h

@@ -89,6 +89,11 @@ public:
      */
     std::string get_error_string() const;    
 
+    /**
+     * Utility function to check for get_error() == RD_KAFKA_RESP_ERR__PARTITION_EOF
+     */
+    bool is_eof() const;
+
     /**
      * Gets the topic that this message belongs to
      */