* Using the keeptree flag allows to generate mocks in a different
directory but keeping the original structure of the repo that is being mocked.

* Very useful for kubernetes client-go that has sometimes 3 versions of the
same interface name hence requires different folders. Easiest way is to keep the
same tree structure as if it was "inPlace".

* KeepTree flag is most useful when used with -all, -dir and -output.