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.
Merge pull request #90 from vuntz/haproxy

Work with keystone behind haproxy + haproxy for ceilometer-server