* Add method to CommandManager to retrieve command names by group
* Add ListCommands
To list command groups loaded by cliff
Change-Id: I37fe2471aa2fafa8aa223159452d52b1981021d6
There are files containing string format arguments inside
logging messages. Using logging function parameters should
be preferred.
Change-Id: Ic749ac9eb55564ed631d57055a5a4dfc3aebd169