MXS-2271 Move script-related settings to the settings-container

Also moves related functions to class methods.

server/core/internal/externcmd.hh

@@ -19,14 +19,14 @@
 
 MXS_BEGIN_DECLS
 
-typedef struct extern_cmd_t
+struct EXTERNCMD
 {
     char** argv;        /**< Argument vector for the command, first being the
                          * actual command being executed */
     int      n_exec;    /**< Number of times executed */
     pid_t    child;     /**< PID of the child process */
     uint32_t timeout;   /**< Command timeout in seconds */
-} EXTERNCMD;
+};
 
 char* externcmd_extract_command(const char* argstr);