MXS-1413: Move cdc_connector into a subdirectory

Moved the cdc_connector into a subdirectory to distinct it from the other
test sources.

maxscale-system-test/cdc_connector/cdc_connector.h

@@ -0,0 +1,47 @@
+#include <cstdint>
+#include <string>
+
+/** Request format flags */
+#define CDC_REQUEST_TYPE_JSON (1 << 0)
+#define CDC_REQUEST_TYPE_AVRO (1 << 1)
+
+namespace CDC
+{
+
+class Connection
+{
+public:
+    Connection(const std::string& address,
+               uint16_t port,
+               const std::string& user,
+               const std::string& password,
+               uint32_t flags = CDC_REQUEST_TYPE_JSON);
+    virtual ~Connection();
+    bool createConnection();
+    bool requestData(const std::string& table, const std::string& gtid = "");
+    bool readRow(std::string& dest);
+    void closeConnection();
+    const std::string& getSchema() const
+    {
+        return m_schema;
+    }
+    const std::string& getError() const
+    {
+        return m_error;
+    }
+
+private:
+    int m_fd;
+    uint32_t m_flags;
+    uint16_t m_port;
+    std::string m_address;
+    std::string m_user;
+    std::string m_password;
+    std::string m_error;
+    std::string m_schema;
+
+    bool doAuth();
+    bool doRegistration();
+};
+
+}