Use service_endpoint as endpoint for environment
Use service_endpoint as endpoint for environment

To enable granular deployment of keystone, we need to know
precisely where keystone will be configured, as we dont have
such API in nailgun, we need to invent some convention.

Important to remember that we also need proxy on port 8888 configured
on a node that consumes configured vip.

Related-Bug: #1470927
Related bp ostf-separate-services-refactor
Change-Id: Ie497bca8818cd0f24eb40df32df227152254a69d

eayunstack/fuel-ostf,stackforge/fuel-ostf,eayunstack/fuel-ostf,stackforge/fuel-ostf