Fix ansible pipelining
Fix ansible pipelining

There's a bug in Ansible 2.4 where the normal option to enable
pipelining is being ignored. To workaround this issue we need to set
"ANSIBLE_PIPELINING" and "ANSIBLE_SSH_PIPELINING".

See https://github.com/ansible/ansible/issues/31125 for more details.

Change-Id: Ib7edc688a2fbc4a3755bec3fbb78a1778219ff14
Signed-off-by: Kevin Carter <ffb54fded2f22052678e45d78b58d223654eb6fa@rackspace.com>

stackforge/os-ansible-deployment,bunchc/openstack-ansible,stackforge/os-ansible-deployment,openstack/openstack-ansible,bunchc/openstack-ansible,openstack/openstack-ansible