Clean up ansible folder some more

Removing old roles, inventories, vars and groups. These are from
earlier testing, so removing to simplify things.

The dev4lmc example shows how you could target a different host, and
also have a different set of TANGO device servers running on that host.
(Note that this part is untested since things were renamed).

The `test_vars.json` are just for testing with something like
`./play-task.sh test_vars.yml local`.  Content doesn't really matter.