Comment 2 for bug 1686664

Reviewed: https://review.openstack.org/460484
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=7a547df426a505d987dd53efb2f59d6ec2f63af8
Submitter: Jenkins
Branch: master

commit 7a547df426a505d987dd53efb2f59d6ec2f63af8
Author: Kevin_Zheng <email address hidden>
Date: Thu Apr 27 18:00:13 2017 +0800

    Fix volume attach tests failing when using FIP as ssh method

    When use floating as connect_method, tests:
    test_attach_detach_volume[id-52e9045a-e90d-4c0d-9087-79d657faffff]
    test_list_get_volume_attachments[id-7fa563fe-f0f7-43eb-9e22-a1ece036b513]
    will fail due to that they are under the same class, so when these tests
    setup, and using floating as connect_method only one floating IP was
    created.We first associated it to instance created at test1 and then we
    created another instance in test2 and tried to associate this IP again to
    the new server, since the IP was already associated to instance created in
    test1, error will happen when try to do this.

    This patch fix this by delete the servers after first test finished.

    Closes-Bug: #1686664

    Change-Id: Ie3afb31bd0d3245760f799b2256228159b328619