Switch to older settings for ansible playbooks and

Switch to older settings for ansible playbooks and
VM creation steps

This change introduces two (older) settings needed for
CentOS 7 which were removed by recent patches that were
tested only on Ubuntu 16.04. These settings have been
already tested on Ubtunu 16.04.

Change-Id: I3039d650b59869d45e11afdda8827c850f686195
Signed-off-by: Rihab Banday <rihab.banday@ericsson.com>
Co-Authored-By: Victor Morales <v.morales@samsung.com>
Reviewed-on: https://gerrit.opnfv.org/gerrit/c/kuberef/+/71233
Tested-by: jenkins-ci <jenkins-opnfv-ci@opnfv.org>
Reviewed-by: Georg Kunz <georg.kunz@ericsson.com>