ffu: Introduce prep workarounds for FFU
ffu: Introduce prep workarounds for FFU

We make sure is_bootstrap_node is always set and we reset hiera
hierarchy on first run.

Resolves: rhbz#1535406
Clodes-Bug: #1743740
Change-Id: Ib5cc32b798118c85bf09beab097be2f6eaeb405f

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates