MXS-2271 Move Monitor inside maxscale-namespace

Rearranged monitor.cc by namespace.

server/modules/monitor/mariadbmon/test/test_cycle_find.cc

@@ -25,6 +25,7 @@
 
 using std::string;
 using std::cout;
+using maxscale::MXS_MONITORED_SERVER;
 
 // Maximum sizes for array types
 const int MAX_CYCLE_SIZE = 10;