Revert "HBASE-17906 When a huge amount of data writing to hbase through thrift2, there will be a deadlock error. (Albert Lee)"

Mistaken commit.

This reverts commit 9dd5cda017.

hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/ThriftServer.java

@@ -432,6 +432,9 @@ public class ThriftServer extends Configured implements Tool {
       throw new RuntimeException("Could not parse the value provided for the port option", e);
     }
 
+    // Thrift's implementation uses '0' as a placeholder for 'use the default.'
+    int backlog = conf.getInt(BACKLOG_CONF_KEY, 0);
+
     // Local hostname and user name,
     // used only if QOP is configured.
     String host = null;