Add public_endpoint option like other service

[Kevin Tibi]

Many openstack service (like keystone) use public_endpoint option for force the URL return by service when you use proxy.

In my case :

USER ==> PROXY HTTPS(proxy) ===> PROXY LOCAL HTTPS (control)=====>HEAT API HTTP control)

On control ==> RequestHeader set X-Forwarded-Proto "https"

heat.conf ==> secure_proxy_ssl_header = X-Forwarded-Proto

[root@control ~(keystone_admin)]# curl https://control:8004/
{"versions": [{"status": "CURRENT", "id": "v1.0", "links": [{"href": "https://control:8004/v1/", "rel": "self"}]}]}

[root@proxy ~(keystone_admin)]# curl https://proxy/orchestration/
{"versions": [{"status": "CURRENT", "id": "v1.0", "links": [{"href": "https://proxy/v1/", "rel": "self"}]}]} <======== NEED TO RETURN href": "https://proxy/orchestration/v1/"

[Adrien Cunin (adri2000)]

Confirmed, experienced exact same issue...

See also bug #1444490.