MXS-1883 Maintenance is now the only user-modifiable bit for a monitored server

The request to turn maintenance off/on is a separate flag, although the actual
status is still contained in the status bitfield.

include/maxscale/server.hh

@@ -0,0 +1,24 @@
+#pragma once
+/*
+ * 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/bsl11.
+ *
+ * Change Date: 2020-01-01
+ *
+ * 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.
+ */
+
+#include <maxscale/cppdefs.hh>
+
+#include <string>
+#include <maxscale/server.h>
+
+namespace maxscale
+{
+    bool server_set_status(SERVER *server, int bit, std::string* errmsg_out = NULL);
+    bool server_clear_status(SERVER *server, int bit, std::string* errmsg_out = NULL);
+}