IcingaDB: subscribe to OnNextCheckChanged signal

We can't drop the `OnNextCheckUpdated` signal entirely yet, as IDO still
relies on it.

Author: yhabteab

lib/icingadb/icingadb-objects.cpp

@@ -150,8 +150,8 @@ void IcingaDB::ConfigStaticInitialize()
 		IcingaDB::NewCheckResultHandler(checkable);
 	});
 
-	Checkable::OnNextCheckUpdated.connect([](const Checkable::Ptr& checkable) {
-		IcingaDB::NextCheckUpdatedHandler(checkable);
+	Checkable::OnNextCheckChanged.connect([](const Checkable::Ptr& checkable, const Value&) {
+		IcingaDB::NextCheckChangedHandler(checkable);
 	});
 
 	Service::OnHostProblemChanged.connect([](const Service::Ptr& service, const CheckResult::Ptr&, const MessageOrigin::Ptr&) {
@@ -3071,7 +3071,7 @@ void IcingaDB::NewCheckResultHandler(const Checkable::Ptr& checkable)
 	}
 }
 
-void IcingaDB::NextCheckUpdatedHandler(const Checkable::Ptr& checkable)
+void IcingaDB::NextCheckChangedHandler(const Checkable::Ptr& checkable)
 {
 	for (auto& rw : ConfigType::GetObjectsByType<IcingaDB>()) {
 		rw->EnqueueConfigObject(checkable, VolatileState | NextUpdate);

lib/icingadb/icingadb.hpp

@@ -369,7 +369,7 @@ class IcingaDB : public ObjectImpl<IcingaDB>
 	static void CommentRemovedHandler(const Comment::Ptr& comment);
 	static void FlappingChangeHandler(const Checkable::Ptr& checkable, double changeTime);
 	static void NewCheckResultHandler(const Checkable::Ptr& checkable);
-	static void NextCheckUpdatedHandler(const Checkable::Ptr& checkable);
+	static void NextCheckChangedHandler(const Checkable::Ptr& checkable);
 	static void DependencyGroupChildRegisteredHandler(const Checkable::Ptr& child, const DependencyGroup::Ptr& dependencyGroup);
 	static void DependencyGroupChildRemovedHandler(const DependencyGroup::Ptr& dependencyGroup, const std::vector<Dependency::Ptr>& dependencies, bool removeGroup);
 	static void HostProblemChangedHandler(const Service::Ptr& service);