Add endpoint_type config option

Prior to their removal from the tempest repository, the heat tests
supported an endpoint_type option[1] to configure which endpoint
interface to use in its requests to the Orchestration service and other
OpenStack services. This patch adds back this support so that users can
configure the heat tests to run against non-public interfaces.

[1] http://git.openstack.org/cgit/openstack/tempest/tree/tempest/config.py?h=17.2.0#n943

Change-Id: Id86f90e428136198b4244f12da5eb53f673fd788
3 files changed