Adds Hiera implementation within Packstack

Packstack configures Hiera as data backend. Packstack puppet templates are now
using hiera() and hiera_array() functions to fetch data from hiera backend.

Packstack generates a defaults.yaml file in the /var/tmp/packstack directory.

Firewall rules for each openstack components are inserted into the hiera
backend as hash and created by the create_resources function.

Change-Id: Iab553a71264b0fc0f26d33a6304b545ad302f664
Fixes: rhbz#1145223
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
Merge "Adds Hiera implementation within Packstack"