[SDFAB-98] Improve logging in several ONOS subsystems

Change-Id: Ic9a20af6da27c3cc5c219657f10999f6804b9334
diff --git a/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/GrpcChannelControllerImpl.java b/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/GrpcChannelControllerImpl.java
index 9e2321e..ca43cac 100644
--- a/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/GrpcChannelControllerImpl.java
+++ b/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/GrpcChannelControllerImpl.java
@@ -210,6 +210,7 @@
 
         channelLocks.get(channelUri).lock();
         try {
+            log.info("Destroying gRPC channel {}...", channelUri);
             final ManagedChannel channel = channels.remove(channelUri);
             if (channel != null) {
                 shutdownNowAndWait(channel, channelUri);