MXS-1220: Use libmicrohttpd for the HTTP handling

The HTTP side of the REST API is better handled with an actual
library. The libmicrohttpd library provides a convenient way of handling
the HTTP traffic between the clients and MaxScale.

server/core/maxscale/admin.hh

@@ -20,57 +20,6 @@
 #include <maxscale/thread.h>
 
 #include "http.hh"
-#include "adminclient.hh"
-
-using std::deque;
-using std::string;
-
-typedef deque<SAdminClient> ClientList;
-
-/** The admin interface configuration */
-struct AdminConfig
-{
-    string         host;
-    uint16_t       port;
-    enum http_auth auth;
-};
-
-class AdminListener
-{
-public:
-    /**
-     * @brief Create a new admin interface instance
-     *
-     * @param sock Listener socket for the interface
-     */
-    AdminListener(int sock);
-    ~AdminListener();
-
-    /**
-     * Start the admin interface
-     */
-    void start();
-
-    /**
-     * Stop the admin listener
-     */
-    void stop();
-
-    /**
-     * Close timed out connections
-     */
-    void check_timeouts();
-
-private:
-    void         handle_clients();
-    void         handle_timeouts();
-    AdminClient* accept_client();
-
-    int        m_socket;  /**< The network socket we listen on */
-    int        m_active;  /**< Positive value if the admin is active */
-    int        m_timeout; /**< Network timeout in seconds */
-    ClientList m_clients;
-};
 
 /**
  * @brief Start the administrative interface
@@ -83,10 +32,3 @@ bool mxs_admin_init();
  * @brief Shutdown the administrative interface
  */
 void mxs_admin_shutdown();
-
-/**
- * @brief Get the administative interface configuration
- *
- * @return A reference to the administrative interface configuration
- */
-AdminConfig& mxs_admin_get_config();