teardown.sh does not cleanup lvm.conf

[David Wilde]

In an AIO we are dropping a new lvm.conf that filters out all block devices. Since this file is not removed the bootstrap-aio.sh script will fail on subsequent runs if new block devices are added.

Steps to reproduce:

1) Create a cloud server and run an aio build
2) Run scripts/teardown.sh
3) Add a block device to the cloud server
4) Run scripts/bootstrap-aio.sh

This will fail with something like the following:

+ pvcreate -ff -y /dev/xvdb1
  Device /dev/xvdb1 not found (or ignored by filtering)

We should replace /etc/lvm/lvm.conf with the backup file created during the ansible run.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/217827

[OpenStack Infra (hudson-openstack)]

Change abandoned by Jesse Pretorius (<email address hidden>) on branch: master
Review: https://review.openstack.org/217827
Reason: This has been untouched for more than three months, so it's being abandoned. If you intend to work on it, then please restore it.

[Jesse Pretorius (jesse-pretorius)]

Milestone will be re-added if/when a patch is submitted.