I am using CentOS7 with repos installed from stein package (centos-openstack-stein) in CentOS7.
I just enable  rdo-trunk-stein-tested because undercloud install do not work from centos-openstack-stein due to unable to mount some path, found that it is known and was fixed in stein tested.

so I succeeded to boot and build everything. but when I use "time openstack --debug overcloud node import setup/hosts.yaml" step, it stops at:
  HTTP POST https://undercloud_public_host:13989/v2/executions 201
  Started Mistral Workflow tripleo.baremetal.v1.register_or_update. Execution ID: 55f14621-cabd-4783-a611-d5b822ad0833
  Waiting for messages on queue 'tripleo' with no timeout.

I can reach iDRAC over ssh, and I can boot Physical HW to PXE.