Comment 4 for bug 1763776

I'm recycling this bug as we still can't use a hostname for undercloud_*_host parameters.

See Jame's bz: https://bugzilla.redhat.com/show_bug.cgi?id=1702814

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If you try and use a hostname for undercloud_admin_host or undercloud_public_host in undercloud.conf it fails with:

[stack@tripleo-08 ~]$ openstack undercloud install
/usr/lib/python2.7/site-packages/requests/__init__.py:91: RequestsDependencyWarning: urllib3 (1.24.1) or chardet (2.2.1) doesn't match a supported version!
  RequestsDependencyWarning)
Exception occured while running the command
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tripleoclient/command.py", line 30, in run
    super(Command, self).run(parsed_args)
  File "/usr/lib/python2.7/site-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/usr/lib/python2.7/site-packages/cliff/command.py", line 184, in run
    return_code = self.take_action(parsed_args) or 0
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/undercloud.py", line 128, in take_action
    dry_run=parsed_args.dry_run)
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/undercloud_config.py", line 392, in prepare_undercloud_deploy
    _process_network_args(env_data)
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/undercloud_config.py", line 336, in _process_network_args
    'AllocationPools': _calculate_allocation_pools(s)
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/undercloud_config.py", line 310, in _calculate_allocation_pools
    ip_set.remove(netaddr.IPNetwork(CONF.undercloud_public_host))
  File "/usr/lib/python2.7/site-packages/netaddr/ip/__init__.py", line 938, in __init__
    raise AddrFormatError('invalid IPNetwork %s' % addr)
AddrFormatError: invalid IPNetwork tripleo-08-undercloud
invalid IPNetwork tripleo-08-undercloud

Many (most?) customers use hostnames for these values, especially when using SSL.
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