Comment 1 for bug 1473508

I had this error when I tried create an stack that include a ceilometer alarm. I found two solutions:

   firstone: changedeferred_auth_method=trusts
      http://hardysteven.blogspot.co.uk/2014/04/heat-auth-model-updates-part-1-trusts.html

   Secondone:creating the heat_stack_user:
      sudo apt-get install python-openstackclient
      openstack role create heat_stack_user

I hope it be usefull