ONOS-1823 and ONOS-1838:Segment Routing Multi-instance Support-1

Change-Id: I3cc848415a609a9c4001d135e51104c62fb2830d
diff --git a/src/main/java/org/onosproject/segmentrouting/DeviceConfiguration.java b/src/main/java/org/onosproject/segmentrouting/DeviceConfiguration.java
index d0721e9..ad8c0a3 100644
--- a/src/main/java/org/onosproject/segmentrouting/DeviceConfiguration.java
+++ b/src/main/java/org/onosproject/segmentrouting/DeviceConfiguration.java
@@ -99,6 +99,9 @@
                     deviceConfigMap.get(deviceId).nodeSid);
             return deviceConfigMap.get(deviceId).nodeSid;
         } else {
+            log.warn("getSegmentId for device {} "
+                    + "throwing IllegalStateException "
+                    + "because device does not exist in config", deviceId);
             throw new IllegalStateException();
         }
     }
@@ -151,6 +154,9 @@
                     deviceConfigMap.get(deviceId).mac);
             return deviceConfigMap.get(deviceId).mac;
         } else {
+            log.warn("getDeviceMac for device {} "
+                    + "throwing IllegalStateException "
+                    + "because device does not exist in config", deviceId);
             throw new IllegalStateException();
         }
     }
@@ -168,6 +174,9 @@
                     deviceConfigMap.get(deviceId).ip);
             return deviceConfigMap.get(deviceId).ip;
         } else {
+            log.warn("getRouterIp for device {} "
+                    + "throwing IllegalStateException "
+                    + "because device does not exist in config", deviceId);
             throw new IllegalStateException();
         }
     }
@@ -187,6 +196,9 @@
                     deviceConfigMap.get(deviceId).isEdge);
             return deviceConfigMap.get(deviceId).isEdge;
         } else {
+            log.warn("isEdgeDevice for device {} "
+                    + "throwing IllegalStateException "
+                    + "because device does not exist in config", deviceId);
             throw new IllegalStateException();
         }
     }