Routing/bridging rules on the same leaf pair should always be programmed by the same ONOS instance

Main change:
- Implement new logic for shouldHandleRouting, along with corresponding unit tests. Also rename it to shouldProgram

Side changes:
- Refactor revokeSubnet such that it is only invoked on the instance that should handle routing change
- Move the following methods to RoutingRulePopulator and follow the same design pattern as populate/revoke subnet/route
    - populateBridging, revokeBridging, updateBridging
    - updateFwdObj
- Make sure the following methods in RoutingRulePopulator are always invoked by DefaultRoutingHandler with shouldProgram check
    - populateRoute, revokeRoute
    - populateSubnet, revokeSubnet
    - populateBridging, revokeBridging, updateBridging
    - updateFwdObj

Change-Id: I903129271ede91c45ebf0d973e06faeae46c157a
diff --git a/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java b/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
index 36a9e79..a7388d1 100644
--- a/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
+++ b/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
@@ -45,10 +45,13 @@
 import org.onosproject.routeservice.RouteEvent;
 import org.onosproject.segmentrouting.config.DeviceConfiguration;
 import org.onosproject.segmentrouting.config.SegmentRoutingDeviceConfig;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.TestConsistentMap;
 
 import java.util.Map;
 import java.util.Set;
 
+import static org.easymock.EasyMock.expect;
 import static org.easymock.EasyMock.reset;
 import static org.junit.Assert.*;
 import static org.easymock.EasyMock.createMock;
@@ -141,6 +144,9 @@
 
         // Initialize Segment Routing Manager
         srManager = new MockSegmentRoutingManager(NEXT_TABLE);
+        srManager.storageService = createMock(StorageService.class);
+        expect(srManager.storageService.consistentMapBuilder()).andReturn(new TestConsistentMap.Builder<>()).anyTimes();
+        replay(srManager.storageService);
         srManager.cfgService = new NetworkConfigRegistryAdapter();
         srManager.deviceConfiguration = createMock(DeviceConfiguration.class);
         srManager.flowObjectiveService = new MockFlowObjectiveService(BRIDGING_TABLE, NEXT_TABLE);