start a connect-tracker for locating db connection leaks
Add default setting to activate NMS-5777 fix
NMS-6051: fix database connection leak
working connection tracker, tested on demo
add a note about deleting spring-aspects*.jar
Remove obsolete comment regarding storeByGroup and graph definitions
clean up database connection usage in old jdbc calls
Merge remote-tracking branch 'origin/1.12'

Conflicts:
	core/daemon/src/main/java/org/opennms/netmgt/vmmgr/DatabaseChecker.java
	opennms-services/src/main/java/org/opennms/netmgt/utils/NodeLabel.java
	opennms-webapp/src/main/java/org/opennms/web/map/db/datasources/ServerDataSource.java
	opennms-webapp/src/main/java/org/opennms/web/notification/NoticeFactory.java
	opennms-webapp/src/main/java/org/opennms/web/notification/NotificationModel.java
	opennms-webapp/src/main/java/org/opennms/web/outage/OutageFactory.java