Tidy up of the exit status based on the issues founf during startup.

See Bugzilla 370.

server/include/maxscale.h

@@ -0,0 +1,43 @@
+#ifndef _MAXSCALE_H
+#define _MAXSCALE_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 2014
+ */
+
+/**
+ * @file maxscale.h
+ *
+ * Some general definitions for MaxScale
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 05/02/14	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+
+/* Exit status for MaxScale */
+#define	MAXSCALE_SHUTDOWN	0	/* Good shutdown */
+#define MAXSCALE_BADCONFIG	1	/* Configuration fiel error */
+#define MAXSCALE_NOLIBRARY	2	/* No embedded library found */
+#define MAXSCALE_NOSERVICES	3	/* No servics are running */
+#define MAXSCALE_HOMELESS	4	/* No MaxScale Home */
+#define MAXSCALE_BADARG		5	/* Bad command line argument */
+#define MAXSCALE_INTERNALERROR	6	/* Internal error, see error log */
+#endif