group_vars: Refactor provisioner/bifrost

This change refactors bifrost provisioner playbooks and
roles to use group_vars instead of using vars from
engine/engine/var directory.

As bifrost/provision.sh is run on localhost initially,
it uses the newly created inventory file, localhost.ini,
to enable the use of group_vars. In the last command of
bifrost/provision.sh, bifrost_inventory.py is copied to
engine/engine/inventory to access to group_vars so the
the new full inventory file, inventory.ini, to use during
stack installation can be generated.

See the first change in series for the reasoning of
switching to group_vars which has additional information
as well.

Change-Id: I0cc76c2d2e1fb3b192e395c64f5df476b68a9200
diff --git a/playbooks/roles/get-baremetal-info/tasks/main.yml b/playbooks/roles/get-baremetal-info/tasks/main.yml
index aca6313..7301ba3 100644
--- a/playbooks/roles/get-baremetal-info/tasks/main.yml
+++ b/playbooks/roles/get-baremetal-info/tasks/main.yml
@@ -54,3 +54,5 @@
   when:
     - interface.macaddress == node.interfaces[idf.net_config.neutron.interface].mac_address
     - "'.' not in interface.device"
+
+# vim: set ts=2 sw=2 expandtab: