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

Also fix missing chassisId in DefaultDeviceDescription.toString()

Change-Id: I944baf0b3a4eb9960c0cbcec2ad585701d9a2989
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 d09a352..0d94c87 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
@@ -478,7 +478,7 @@
                 //getting the device description
                 DeviceDescription deviceDescription = getDeviceDescription(deviceId, config);
                 //connecting device to ONOS
-                log.debug("Connected NETCONF device {}, on {}:{} with username {}",
+                log.debug("Connected NETCONF device {}, on {}:{} {} with username {}",
                         deviceId, config.ip(), config.port(),
                         (config.path().isPresent() ? "/" + config.path().get() : ""),
                         config.username());