Added help to the CLI and fixed a bug that was causing it to crash
after my last submit. There is still cleanup left to do  in the way
tables are displayed as a result of the changes. This will be tackled
in a subsequent update.

Change-Id: Id09c39e24a5dbfb3ebce45783b4e7ec2096e905e
diff --git a/cli/main.py b/cli/main.py
index f125634..ec84bf5 100755
--- a/cli/main.py
+++ b/cli/main.py
@@ -153,7 +153,7 @@
         """List loaded adapter"""
         stub = voltha_pb2.VolthaLocalServiceStub(self.get_channel())
         res = stub.ListAdapters(Empty())
-        omit_fields = {}
+        omit_fields = {'config.log_level', 'logical_device_ids'}
         print_pb_list_as_table('Adapters:', res.items, omit_fields, self.poutput)
 
     def get_devices(self):