Fail to upgrade OCP from v3.4 to v3.5 with quick installer due to wrong variant version.

Issue

• Fail to upgrade OCP from v3.4 to v3.5 with quick installer due to wrong variant version with below errors:

Traceback (most recent call last):
  File "/usr/bin/atomic-openshift-installer", line 9, in <module>
    load_entry_point('ooinstall==3.0.0', 'console_scripts', 'oo-install')()
  File "/usr/lib/python2.7/site-packages/click/core.py", line 664, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/click/core.py", line 644, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python2.7/site-packages/click/core.py", line 991, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python2.7/site-packages/click/core.py", line 837, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python2.7/site-packages/click/core.py", line 464, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/ooinstall/cli_installer.py", line 1031, in upgrade
    ctx.obj['verbose'])
  File "/usr/lib/python2.7/site-packages/ooinstall/openshift_ansible.py", line 333, in run_upgrade_playbook
    inventory_file = generate_inventory(hosts)
  File "/usr/lib/python2.7/site-packages/ooinstall/openshift_ansible.py", line 63, in generate_inventory
    write_inventory_vars(base_inventory, lb)
  File "/usr/lib/python2.7/site-packages/ooinstall/openshift_ansible.py", line 142, in write_inventory_vars
    base_inventory.write('deployment_type={}\n'.format(ver.ansible_key))
AttributeError: 'NoneType' object has no attribute 'ansible_key'