Trigger pipeconf deploy right after registration

Without waiting for the next pipeconf watchdog periodic probe.
To support this, this patch extends the PiPipeconfService to advertise
pipeconf registration events.

Change-Id: Ib44f1813bd37083c666a5e7980de320ce469c2d2
diff --git a/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/PipeconfLoader.java b/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/PipeconfLoader.java
index d1cd0e3..5fca57b 100644
--- a/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/PipeconfLoader.java
+++ b/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/PipeconfLoader.java
@@ -101,7 +101,7 @@
 
     @Deactivate
     public void deactivate() {
-        PIPECONFS.stream().map(PiPipeconf::id).forEach(piPipeconfService::remove);
+        PIPECONFS.stream().map(PiPipeconf::id).forEach(piPipeconfService::unregister);
     }
 
     private static Collection<PiPipeconf> buildAllPipeconf() {