Includes fixes that remove need for interface hardcoding and adds

Includes fixes that remove need for interface hardcoding and adds
support for Foreman REST API access

Changes include:
 - No more requirement to provide ovs_tunnel_if or storage_iface as
hardcoded interface names. private_network and storage_network are now
dynamically figured out and resolve to the interface names during puppet
module runtime
 - Adds some code to modify the Foreman API variable.  This is used for
REST API access to rebuild the nodes and control Foreman via Khaleesi

JIRA: BGS-31

Change-Id: I9a3a6590c3b9801e026a6f333782d04d9e2eff6f
Signed-off-by: Tim Rozet <trozet@redhat.com>