add json annotation for IDC (#354)

Author: JackShi148

src/main/java/com/alipay/oceanbase/rpc/location/model/OcpResponseData.java

@@ -75,6 +75,7 @@ public void setRsList(List<OcpResponseDataRs> rsList) {
     /*
      * Get IDC list.
      */
+    @JsonProperty("IDCList")
     public List<OcpResponseDataIDC> getIDCList() {
         return IDCList;
     }

src/main/java/com/alipay/oceanbase/rpc/location/model/OcpResponseDataIDC.java

@@ -22,13 +22,16 @@
  *
  */
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+
 public class OcpResponseDataIDC {
     private String idc;
     private String region;
 
     /*
      * Get idc.
      */
+    @JsonProperty("idc")
     public String getIdc() {
         return idc;
     }
@@ -43,6 +46,7 @@ public void setIdc(String idc) {
     /*
      * Get region.
      */
+    @JsonProperty("region")
     public String getRegion() {
         return region;
     }