Merge pull request #51 from robparrott/master

starting a single havana build for development purposes.
Merge branch 'master' of github.com:huit/nepho into feature/openstack-havana
pull in OpenStack changes, including adaptations to make CentOS and RHEL work as well as Amazon LInux.
stop trying to stop sendmail ... may not be there.
Merge branch 'master' of github.com:huit/nepho into feature/openstack-havana
open ports and configure via packstack to use external IPs
switch over havana script to look like this one.
Merge branch 'master' of github.com:huit/nepho into feature/openstack-havana
Merge branch 'master' of github.com:huit/nepho
merge two different tracks
Merge branch 'feature/openstack-havana' into lotsa-changes