Fix to work when keystone is behind haproxy
Use new helpers to get hostnames for endpoints
Moved role constraints into model and removed edit deployment

(cherry picked from commit 7062e7e572d1bf7bf33d3403ced1b03981281de8)
Merge pull request #190 from vuntz/release/roxy/master

Moved role constraints into model and removed edit deployment
Removed the single assignment block from constraints
Merge pull request #191 from tboerger/feature/roxy/fix-constraints

Removed the single assignment block from constraints
Merge pull request #187 from vuntz/haproxy

Work with keystone behind haproxy
Merge branch 'release/roxy/master' into roxy-sync
Merge pull request #195 from vuntz/roxy-sync

Merge roxy branch into stoney