Due to recent changes in inventory creation, node names use FQDN and
this may cause issues when deciding whether a node is an OCP node or
not. Example: "compute-0.ocp.openstack.lab" is not an OCP node, but
"ocp" is part of its hostname.
With this patch, the issue with FQDNs is resolved by checking how the
hostname starts.
Change-Id: I75ad4316338effccb67614997909ee7d7ff17c65