Make the logging level to debug to mitigate verbose message of ovsdb

Change-Id: I1abcfc5d36fe63e8365168036134723219465086
diff --git a/providers/ovsdb/device/src/main/java/org/onosproject/ovsdb/providers/device/OvsdbDeviceProvider.java b/providers/ovsdb/device/src/main/java/org/onosproject/ovsdb/providers/device/OvsdbDeviceProvider.java
index dbe7bae..63aad2a 100644
--- a/providers/ovsdb/device/src/main/java/org/onosproject/ovsdb/providers/device/OvsdbDeviceProvider.java
+++ b/providers/ovsdb/device/src/main/java/org/onosproject/ovsdb/providers/device/OvsdbDeviceProvider.java
@@ -111,7 +111,7 @@
 
     @Override
     public void triggerProbe(DeviceId deviceId) {
-        log.info("Triggering probe on device {}", deviceId);
+        log.debug("Triggering probe on device {}", deviceId);
         if (!isReachable(deviceId)) {
             log.error("Failed to probe device {}", deviceId);
             providerService.deviceDisconnected(deviceId);