Merge pull request #256 from RongtongJin/remove_import

[ISSUE #255] Remove useless import

Author: tsunghanjacktsai

proxy/src/main/java/io/openmessaging/storage/dledger/proxy/ConfigManager.java

@@ -23,8 +23,6 @@
 import java.util.Map;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.util.concurrent.ConcurrentHashMap;