Remove empty CLI source files

A few empty files were added to anchor module structure back when we
had no CLI implemented. This anchor is no longer needed because we
already have some CLI subcommands implemented. Now we just keep adding
empty files for the sake of consistency whenever we implement new
Python bindings, which causes confusion when doing reviews. We should
remove the empty files.

Change-Id: Ia0f6677f532bbe2c65cb189acd91aa55676ccfb5
Closes-Bug: #1250068