Clean up logging in (or relevant to) Juniper NETCONF provider

Also fix missing chassisId in DefaultDeviceDescription.toString()

Change-Id: I944baf0b3a4eb9960c0cbcec2ad585701d9a2989
diff --git a/core/api/src/main/java/org/onosproject/net/device/DefaultDeviceDescription.java b/core/api/src/main/java/org/onosproject/net/device/DefaultDeviceDescription.java
index a331f69..eb5f16a 100644
--- a/core/api/src/main/java/org/onosproject/net/device/DefaultDeviceDescription.java
+++ b/core/api/src/main/java/org/onosproject/net/device/DefaultDeviceDescription.java
@@ -212,6 +212,7 @@
                 .add("uri", uri).add("type", type).add("mfr", manufacturer)
                 .add("hw", hwVersion).add("sw", swVersion)
                 .add("serial", serialNumber)
+                .add("chassisId", chassisId)
                 .add("annotations", annotations())
                 .toString();
     }