Removed the single assignment block from constraints
Merge pull request #95 from tboerger/feature/roxy/fix-constraints

Removed the single assignment block from constraints
Fix to work when keystone is behind haproxy
Use new helpers to get hostnames for endpoints
HAProxy support for ceilometer-api
Only setup mongodb on cluster founder node when doing HA

This is clearly not good for HA, but at least this will make things work
for now.