change RPC_OPERATION_TIMEOUT default value from 10 seconds to 2 second (#270)

Author: WeiXinChan

src/main/java/com/alipay/oceanbase/rpc/property/Property.java

@@ -119,7 +119,7 @@ public enum Property {
 
     RPC_LOGIN_TRY_TIMES("rpc.login.try.times", 3, "请求RPC登录的尝试次数"),
 
-    RPC_OPERATION_TIMEOUT("rpc.operation.timeout", 10000L, "OB内部执行RPC请求的超时时间"),
+    RPC_OPERATION_TIMEOUT("rpc.operation.timeout", 2000L, "OB内部执行RPC请求的超时时间"),
 
     // [ObTable][CONNECTION_POOL]
     SERVER_CONNECTION_POOL_SIZE("server.connection.pool.size", 1, "单个SERVER的连接数"),