Update Ansible to 2.5.5
Update Ansible to 2.5.5

This fixes several performance and module issues. One such issue we'll
need resolved can be seen here:
 * https://github.com/ansible/ansible-modules-extras/issues/1278

Without this fix the `rabbitmq_user` module will stacktrace if the user
password is change.

Change-Id: Ibab4b2e5478d73d01bd8465417f3a1aa7c7469dd
Signed-off-by: Kevin Carter <ffb54fded2f22052678e45d78b58d223654eb6fa@rackspace.com>

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