Ensure that constraints are used for AIO bootstrap
Ensure that constraints are used for AIO bootstrap

Currently the pip_install role does not configure any
constraints when exercising the AIO bootstrap, creating
the possibility that the initial bootstrap may not have
the right software versions.

This patch ensures that the same constraints are used
for the AIO bootstrap as was done for the Ansible
bootstrap.

Change-Id: I6aa467d4f1f6db33c824f4fcf8e46adb0a26cfa0

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