[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-pistache/api/PetApi.h

@@ -0,0 +1,144 @@
+/**
+* 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 (https://openapi-generator.tech).
+* https://openapi-generator.tech
+* Do not edit the class manually.
+*/
+/*
+ * PetApi.h
+ *
+ * 
+ */
+
+#ifndef PetApi_H_
+#define PetApi_H_
+
+
+#include <pistache/endpoint.h>
+#include <pistache/http.h>
+#include <pistache/router.h>
+#include <pistache/http_headers.h>
+
+#include "ApiResponse.h"
+#include "Pet.h"
+#include <string>
+
+namespace org {
+namespace openapitools {
+namespace server {
+namespace api {
+
+using namespace org::openapitools::server::model;
+
+class  PetApi {
+public:
+    PetApi(Pistache::Address addr);
+    virtual ~PetApi() {};
+    void init(size_t thr);
+    void start();
+    void shutdown();
+
+    const std::string base = "/v2";
+
+private:
+    void setupRoutes();
+
+    void add_pet_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void delete_pet_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void find_pets_by_status_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void find_pets_by_tags_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void get_pet_by_id_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void update_pet_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void update_pet_with_form_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void upload_file_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+    void pet_api_default_handler(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter response);
+
+    std::shared_ptr<Pistache::Http::Endpoint> httpEndpoint;
+    Pistache::Rest::Router router;
+
+
+    /// <summary>
+    /// Add a new pet to the store
+    /// </summary>
+    /// <remarks>
+    /// 
+    /// </remarks>
+    /// <param name="pet">Pet object that needs to be added to the store</param>
+    virtual void add_pet(const std::shared_ptr<Pet> &pet, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// Deletes a pet
+    /// </summary>
+    /// <remarks>
+    /// 
+    /// </remarks>
+    /// <param name="petId">Pet id to delete</param>
+    /// <param name="apiKey"> (optional)</param>
+    virtual void delete_pet(const int64_t &petId, const Optional<Net::Http::Header::Raw> &apiKey, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// Finds Pets by status
+    /// </summary>
+    /// <remarks>
+    /// Multiple status values can be provided with comma separated strings
+    /// </remarks>
+    /// <param name="status">Status values that need to be considered for filter</param>
+    virtual void find_pets_by_status(const Optional<std::string> &status, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// Finds Pets by tags
+    /// </summary>
+    /// <remarks>
+    /// Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing.
+    /// </remarks>
+    /// <param name="tags">Tags to filter by</param>
+    virtual void find_pets_by_tags(const Optional<std::string> &tags, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// Find pet by ID
+    /// </summary>
+    /// <remarks>
+    /// Returns a single pet
+    /// </remarks>
+    /// <param name="petId">ID of pet to return</param>
+    virtual void get_pet_by_id(const int64_t &petId, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// Update an existing pet
+    /// </summary>
+    /// <remarks>
+    /// 
+    /// </remarks>
+    /// <param name="pet">Pet object that needs to be added to the store</param>
+    virtual void update_pet(const std::shared_ptr<Pet> &pet, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// Updates a pet in the store with form data
+    /// </summary>
+    /// <remarks>
+    /// 
+    /// </remarks>
+    virtual void update_pet_with_form(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter &response) = 0;
+
+    /// <summary>
+    /// uploads an image
+    /// </summary>
+    /// <remarks>
+    /// 
+    /// </remarks>
+    virtual void upload_file(const Pistache::Rest::Request &request, Pistache::Http::ResponseWriter &response) = 0;
+
+};
+
+}
+}
+}
+}
+
+#endif /* PetApi_H_ */
+