While in Nova, placement functional test code was relegated to the
'nova/tests/functional/api/openstack/placement/' directory. This commit
moves the contents of that directory to 'placement/tests/functional/',
and removes the unnecesary directories. It also removes the files
related to Nova aggregates that were preserved in the filter_history.sh
script.
Change-Id: I5af2e074f2e1bcb90f32589fce819bd4872b6871