[C++ server] Adjust the names (script, sample folder, generator) to lang option (#250)

* Renamce C++ server scripts

* Change output folder

* Rename sample folder: pistache-server -> cpp-pistache

* Rename sample folder: restbed -> cpp-restbed

samples/server/petstore/cpp-restbed/model/ApiResponse.h

@@ -0,0 +1,74 @@
+/**
+ * OpenAPI Petstore
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * OpenAPI spec version: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI-Generator 3.0.0-SNAPSHOT.
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+/*
+ * ApiResponse.h
+ *
+ * Describes the result of uploading an image resource
+ */
+
+#ifndef ApiResponse_H_
+#define ApiResponse_H_
+
+
+
+#include <string>
+#include <memory>
+
+namespace org {
+namespace openapitools {
+namespace server {
+namespace model {
+
+/// <summary>
+/// Describes the result of uploading an image resource
+/// </summary>
+class  ApiResponse
+{
+public:
+    ApiResponse();
+    virtual ~ApiResponse();
+    
+    std::string toJsonString();
+    void fromJsonString(std::string const& jsonString);
+
+    /////////////////////////////////////////////
+    /// ApiResponse members
+    
+    /// <summary>
+    /// 
+    /// </summary>
+    int32_t getCode() const;
+    void setCode(int32_t value);
+    /// <summary>
+    /// 
+    /// </summary>
+    std::string getType() const;
+    void setType(std::string value);
+    /// <summary>
+    /// 
+    /// </summary>
+    std::string getMessage() const;
+    void setMessage(std::string value);
+
+protected:
+    int32_t m_Code;
+    std::string m_Type;
+    std::string m_Message;
+};
+
+}
+}
+}
+}
+
+#endif /* ApiResponse_H_ */