Comment 5 for bug 1583208

Heat is deployed with reauthentication_auth_method=trusts if Sahara is enabled. There is an incompatibility with this option and ceilometer client plugin. We've already fixed it in mitaka/9.0, but didn't backport it to liberty.
Could you please try applying this patch http://paste.openstack.org/show/508621/ ?
Fix in upstream here: https://review.openstack.org/#/c/326405/