Need to delete host-only interfaces on cleanup

[Kyrylo Romanenko]

After VMs shutdown by virtualbox/clean.sh script we need to delete host-only interfaces.

[Oleksiy Butenko (obutenko)]

https://review.openstack.org/#/c/206980/

[Matthew Mosesohn (raytrac3r)]

What is the justification here? What negative impact is there in leaving them?

[Kyrylo Romanenko (kromanenko)]

To avoid cluttering of test environment with obsolete interfaces, especially when running several Fuel environments.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/206980
Committed: https://git.openstack.org/cgit/openstack/fuel-main/commit/?id=d8cd79e4f5aac8b05f1abe8c5e5810512418027d
Submitter: Jenkins
Branch: master

commit d8cd79e4f5aac8b05f1abe8c5e5810512418027d
Author: Kyrylo Romanenko <email address hidden>
Date: Wed Jul 29 13:39:50 2015 +0300

    Add script to delete host-only network interfaces

    Set VirtualBox directory to PATH in clean.sh.
    Call interfaces deletion from clean.sh.

    Closes-Bug: #1493275
    Change-Id: I9d3a62997e22210129418cdab603f4f43ace510e

[Anastasia Palkina (apalkina)]

Verified on ISO #478