Manage misleading log messages

- Reduce logging for
  - Packet rule installation failure for NETCONF packet switch
  - NETCONF device which does not support port stats

Change-Id: I4721f65088f34d3e473f22738f27e093fe8df270
diff --git a/providers/netconf/device/src/main/java/org/onosproject/provider/netconf/device/impl/NetconfDeviceProvider.java b/providers/netconf/device/src/main/java/org/onosproject/provider/netconf/device/impl/NetconfDeviceProvider.java
index be5a936..5ddbba0 100644
--- a/providers/netconf/device/src/main/java/org/onosproject/provider/netconf/device/impl/NetconfDeviceProvider.java
+++ b/providers/netconf/device/src/main/java/org/onosproject/provider/netconf/device/impl/NetconfDeviceProvider.java
@@ -257,7 +257,7 @@
     @Override
     public void triggerProbe(DeviceId deviceId) {
         // TODO: This will be implemented later.
-        log.info("Triggering probe on device {}", deviceId);
+        log.debug("Should be triggering probe on device {}", deviceId);
     }
 
     @Override
@@ -424,8 +424,8 @@
                                                      portStatistics);
             }
         } else {
-            log.warn("No port statistics getter behaviour for device {}",
-                     device.id());
+            log.debug("No port statistics getter behaviour for device {}",
+                      device.id());
         }
     }