Orphan Floating IP cleanup scripts have inconsistent logic

[Kurt]

The neutron/listorphans.py script looks for floating ips without a tenant. The neutron/delete_orphan_floatingips.py script delete floating ips that are not assigned to an instance.

Users who run the first script as a predictor of what the second script will do are in for a surprise.

I suggest adding another script to delete floating ips without a tenant to reflect the logic in listorphans.py and adding a "--dry-run" flag to both.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/230226
Committed: https://git.openstack.org/cgit/openstack/osops-tools-generic/commit/?id=feb571c9859e6f10fd45f1774446336784ca484c
Submitter: Jenkins
Branch: master

commit feb571c9859e6f10fd45f1774446336784ca484c
Author: Kurt Payne <email address hidden>
Date: Thu Oct 1 17:27:53 2015 -0700

    Add a dry-run flag. Fix inconsistency with 'list' and 'delete' orphans

    Closes-Bug: #1501965

    Change-Id: If9b6af6397512c6e55aaf1116b3788d23a4f3551