Not sure if it's related, but while adding the host, about a minute before the 
timeout\error occurs, /var/log/vdsm/mom.log shows:

2019-06-16 22:58:46,799 - mom - ERROR - Failed to initialize MOM threads
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/mom/__init__.py", line 29, in run
    hypervisor_iface = self.get_hypervisor_interface()
  File "/usr/lib/python2.7/site-packages/mom/__init__.py", line 217, in 
get_hypervisor_interface
    return module.instance(self.config)
  File 
"/usr/lib/python2.7/site-packages/mom/HypervisorInterfaces/vdsmjsonrpcclientInterface.py",
 line 96, in instance
    return JsonRpcVdsmClientInterface()
  File 
"/usr/lib/python2.7/site-packages/mom/HypervisorInterfaces/vdsmjsonrpcclientInterface.py",
 line 31, in __init__
    self._vdsm_api = client.connect(host="localhost")
  File "/usr/lib/python2.7/site-packages/vdsm/client.py", line 157, in connect
    raise ConnectionError(host, port, use_tls, timeout, e)
ConnectionError: Connection to localhost:54321 with use_tls=True, timeout=60 
failed: [Errno 111] Connection refused

Is this the cause or is this benign?

As for your suggestion for the engine-VM, for now I've switched to using plain 
CentOS instead of Node, and this shows the problem occurs prior to adding the 
engine-VM.  The failure occurs in the stage before: adding a new host.  
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