Adding maven-scr-plugin to provide tree pom.xml; components are now igniting.
diff --git a/net/core/src/main/java/org/onlab/onos/net/impl/SimpleDeviceManager.java b/net/core/src/main/java/org/onlab/onos/net/impl/SimpleDeviceManager.java
index 767169a..dc18065 100644
--- a/net/core/src/main/java/org/onlab/onos/net/impl/SimpleDeviceManager.java
+++ b/net/core/src/main/java/org/onlab/onos/net/impl/SimpleDeviceManager.java
@@ -41,11 +41,13 @@
 
     @Override
     public DeviceProviderService register(DeviceProvider provider) {
+        log.info("Registering provider {}", provider.id());
         return broker.register(provider);
     }
 
     @Override
     public void unregister(DeviceProvider provider) {
+        log.info("Unregistering provider {}", provider.id());
         broker.unregister(provider);
     }