subscription-manager コマンドが "EntitlementCertificate object has no attribute alt_name" エラーで失敗する

Issue

• システムを RHSM に登録するときに、subscription-manager コマンドが次のエラーで失敗します。

[root@~]# subscription-manager register 
'EntitlementCertificate' object has no attribute 'alt_name'

• トレースバックは、'subscription-manager register' コマンドの実行中に /var/log/rhsm/rhsm.log に表示されます。

EntitlementCertificate' object has no attribute 'alt_name'
2018-11-20 16:59:27,322 [INFO] rhsmd:12812:MainThread @rhsmd:279 - rhsmd started
2018-11-20 16:59:27,467 [ERROR] subscription-manager:12806:MainThread @managercli.py:181 - exception caught in subscription-manager
2018-11-20 16:59:27,468 [ERROR] subscription-manager:12806:MainThread @managercli.py:182 - 'EntitlementCertificate' object has no attribute 'alt_name'
Traceback (most recent call last):
  File "/usr/sbin/subscription-manager", line 96, in <module>
    sys.exit(abs(main() or 0))
  File "/usr/sbin/subscription-manager", line 87, in main
    return managercli.ManagerCLI().main()
  File "/usr/lib64/python2.7/site-packages/subscription_manager/managercli.py", line 2618, in __init__
    CLI.__init__(self, command_classes=commands)
  File "/usr/lib64/python2.7/site-packages/subscription_manager/cli.py", line 99, in __init__
    cmd=clazz()
  File "/usr/lib64/python2.7/site-packages/subscription_manager/managercli.py", line 974, in __init__
    super(RegisterCommand, self).__init__("register", shortdesc, True)
  File "/usr/lib64/python2.7/site-packages/subscription_manager/managercli.py", line 522, in __init__
    super(UserPassCommand, self).__init__(name, shortdesc, primary)
  File "/usr/lib64/python2.7/site-packages/subscription_manager/managercli.py", line 252, in __init__
    self.identity=inj.require(inj.IDENTITY)
  File "/usr/lib64/python2.7/site-packages/subscription_manager/injection.py", line 106, in require
    return FEATURES.require(feature, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/subscription_manager/injection.py", line 80, in require
    self.providers[feature]=provider(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/subscription_manager/identity.py", line 133, in __init__
    self.reload()
  File "/usr/lib64/python2.7/site-packages/subscription_manager/identity.py", line 148, in reload
    self._name=self.consumer.getConsumerName()
  File "/usr/lib64/python2.7/site-packages/subscription_manager/identity.py", line 87, in getConsumerName
    altName=self.x509.alt_name
AttributeError: 'EntitlementCertificate' object has no attribute 'alt_name'