MXS-1944 Store failover parameters in an object

Several of the parameters are passed on from function to function. Having them all
in an object cleans things up and makes adding more data easier.

server/modules/monitor/mariadbmon/mariadbmon_common.cc

@@ -32,3 +32,16 @@ void DelimitedPrinter::cat(string& target, const string& addition)
     target += m_current_separator + addition;
     m_current_separator = m_separator;
 }
+
+ClusterOperation::ClusterOperation(OperationType type,
+                                   MariaDBServer* promotion_target, MariaDBServer* demotion_target,
+                                   bool demo_target_is_master, bool handle_events,
+                                   json_t** error, maxbase::Duration time_remaining)
+    : type(type)
+    , promotion_target(promotion_target)
+    , demotion_target(demotion_target)
+    , demotion_target_is_master(demo_target_is_master)
+    , handle_events(handle_events)
+    , error_out(error)
+    , time_remaining(time_remaining)
+{}