Remove unreachable old file admin/error.jsp (NMS-6147)

Conflicts:
	opennms-webapp/src/main/webapp/admin/error.jsp
initial commit for search
Merge branch 'space/13.2' into space/feature/searchtool
Lint cleanup (toLowerCase().equals(), unused protected fields).
Merge branch 'master' into soleger-master
Final modifier cleanup on public static fields.
add search providers
Merge branch 'space/13.2' into space/feature/searchtool

Conflicts:
	features/opennms-osgi-core/src/main/java/org/opennms/osgi/internal/OnmsServiceManagerImpl.java
	features/topology-map/plugins/org.opennms.features.topology.plugins.topo.linkd/src/main/java/org/opennms/features/topology/plugins/topo/linkd/internal/LinkdTopologyProvider.java
Fix for NMS-6141 - Set default log level to WARN (like 1.10)
Changed null status provider to prevent NPE when disabling status.
Added code to load a set of focus nodes from the URL query string.
Fixed History entries does not get cleaned up after 1st save.
Merge branch 'space/13.2' of github.com:OpenNMS/opennms into space/13.2
Merge remote-tracking branch 'origin/1.12' into space/13.2

Conflicts:
	opennms-base-assembly/src/main/filtered/etc/log4j.properties
implement mock reload()
fix merge error
[bamboo] Automated branch merge (from space/13.2:26e86ae4180c32aa4a4b6e965d39d293487ce46b)
NMS-6168 - maint_events.sh is not working
Merge remote-tracking branch 'origin/1.10' into 1.12
Added focus node list to the SavedHistory. Undid change where history was cleaned up
after each save since this breaks the back button history function.