Addition of the administration user in the service

Addition of general purpose hashtable (not complete) and users table (not complete)

include/users.h

@@ -0,0 +1,43 @@
+#ifndef _USERS_H
+#define _USERS_H
+/*
+ * This file is distributed as part of the SkySQL Gateway.  It is free
+ * software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation,
+ * version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright SkySQL Ab 2013
+ */
+#include <hashtable.h>
+/**
+ * @file users.h The functions to manipulate the table of users maintained
+ * for each service
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 23/06/13	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+
+typedef struct users {
+	HASHTABLE	*data;
+} USERS;
+
+extern USERS	*users_alloc();				/**< Allocate a users table */
+extern		users_free(USERS *);			/**< Free a users table */
+extern int	users_add(USERS *, char *, char *);	/**< Add a user to the users table */
+extern int	users_delete(USERS *, char *);		/**< Delete a user from the users table */
+extern char	*users_fetch(USERS *, char *);		/**< Fetch the authentication data for a user */
+#endif