move ovs cleanup to tools/cleanup-host

- One of the usecase supported by tools/cleanup-containers
  was the ablity to remove container with a regex so that
  you could redepoloy just that single componet.
- By cleaning up ovs in cleanup-containers that is nolonger
  possible.
- This change move the cleanup of ovs from,
  tools/cleanup-contianers to tools/cleanup-hosts

TrivialFix

Change-Id: If2001130f4a2400555ce4d9ac5ee506482e4c25e