Various fixes for OpenStack & general

* public IP is now assigned to inception server successfully
* inception.initial_user can override "ubuntu" default user assumption
* don't attempt to tag OpenStack server (not supported)
Allow chef user to be root

Specify the target home folder of chef user via `node["user"]["home"]`
fix aws spec after refactoring
AWS::Address has #public_ip instead of #ip
Merge pull request #46 from cloudfoundry-community/openstack

Openstack support