Comment 5 for bug 1934646

Reviewed: https://review.opendev.org/c/openstack/neutron/+/799438
Committed: https://opendev.org/openstack/neutron/commit/3b46df48476fdfd5a479ad537d190474f39e395b
Submitter: "Zuul (22348)"
Branch: master

commit 3b46df48476fdfd5a479ad537d190474f39e395b
Author: LIU Yulong <email address hidden>
Date: Mon Jul 5 15:19:54 2021 +0800

    Change fullstack dhclient lease file to tmp folder

    Each cases are sharing the common lease path for dhclient,
    for instance, in CentOS it is: /var/lib/dhclient/dhclient.leases.
    That means all fullstack cases will use this file to store
    fake VM's NIC DHCP lease information.

    After run several times of fullstack cases, the dhclient will
    get failed to set the test fake VM port's IP due to the mess
    settings in this file.

    This patch sets each fake VM's NIC lease file path to the
    tmp folder with it's port id.

    This may fix some cases that cannot set the IP addr to the test
    device properly via DHCP.

    Closes-Bug: #1934646
    Change-Id: Ia87fa7c08df473acbcf1600035d99a83ed4b4375