test: fix NetworkOrchestrator unit test failure (#7049)

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

Author: shwstppr

engine/orchestration/src/test/java/org/apache/cloudstack/engine/orchestration/NetworkOrchestratorTest.java

@@ -38,6 +38,7 @@
 import org.mockito.Matchers;
 import org.mockito.Mockito;
 
+import com.cloud.api.query.dao.DomainRouterJoinDao;
 import com.cloud.dc.Vlan;
 import com.cloud.dc.VlanVO;
 import com.cloud.dc.dao.VlanDao;
@@ -123,6 +124,7 @@ public void setUp() {
         testOrchastrator.routerDao = mock(DomainRouterDao.class);
         testOrchastrator.routerNetworkDao = mock(RouterNetworkDao.class);
         testOrchastrator._vpcMgr = mock(VpcManager.class);
+        testOrchastrator.routerJoinDao = mock(DomainRouterJoinDao.class);
         DhcpServiceProvider provider = mock(DhcpServiceProvider.class);
 
         Map<Network.Capability, String> capabilities = new HashMap<Network.Capability, String>();