Demoting boy-cried-wolf log messages.

Change-Id: Idfb9b3178b79ab6b30af285c10a52b9f20dfbfe1
diff --git a/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/OpenFlowControllerImpl.java b/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/OpenFlowControllerImpl.java
index b361478..416abd3 100644
--- a/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/OpenFlowControllerImpl.java
+++ b/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/OpenFlowControllerImpl.java
@@ -25,6 +25,7 @@
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
+import org.onosproject.net.driver.DefaultDriverProviderService;
 import org.onosproject.net.driver.DriverService;
 import org.onosproject.openflow.controller.DefaultOpenFlowPacketContext;
 import org.onosproject.openflow.controller.Dpid;
@@ -81,6 +82,10 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected DriverService driverService;
 
+    // References exists merely for sequencing purpose to assure drivers are loaded
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DefaultDriverProviderService defaultDriverProviderService;
+
     private final ExecutorService executorMsgs =
         Executors.newFixedThreadPool(32, groupedThreads("onos/of", "event-stats-%d"));
 
@@ -507,11 +512,10 @@
             connectedSwitches.remove(dpid);
             OpenFlowSwitch sw = activeMasterSwitches.remove(dpid);
             if (sw == null) {
-                log.warn("sw was null for {}", dpid);
+                log.debug("sw was null for {}", dpid);
                 sw = activeEqualSwitches.remove(dpid);
             }
             for (OpenFlowSwitchListener l : ofSwitchListener) {
-                log.warn("removal for {}", dpid);
                 l.switchRemoved(dpid);
             }
         }