Updated openstack/openstack
Project: openstack/heat  1b8d5ef697a7b4fffbad22aaa206f75b5fb4286c

Support proxying Heat API by using x-forwarded-for header

Adding 'X-Forwarded-For' header support to enable  Heat API
proxying

Implements: blueprint proxying-heat-api
Change-Id: I36a0d3dd3f672a485c4a9c0cd541b705033e9025