Move headers from server/include to include/maxscale

- Headers now to be included as <maxscale/xyz.h>
- First step, no cleanup of headers has been made. Only moving
  from one place to another + necessary modifications.

include/maxscale/maxscale.h

@@ -0,0 +1,46 @@
+#ifndef _MAXSCALE_H
+#define _MAXSCALE_H
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl.
+ *
+ * Change Date: 2019-07-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+/**
+ * @file maxscale.h
+ *
+ * Some general definitions for MaxScale
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date     Who             Description
+ * 05/02/14 Mark Riddoch    Initial implementation
+ *
+ * @endverbatim
+ */
+
+#include <time.h>
+
+
+/* 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_ALREADYRUNNING 4   /* MaxScale is already runing */
+#define MAXSCALE_BADARG         5   /* Bad command line argument */
+#define MAXSCALE_INTERNALERROR  6   /* Internal error, see error log */
+
+void maxscale_reset_starttime(void);
+time_t maxscale_started(void);
+int maxscale_uptime(void);
+
+#endif