Juno experimentation

WIP experiment

Changes so far:
 - Use Centos 7 vagrant vm for allinone node to get Juno packages
 - Use Ubuntu vm for puppet node to avoid ruby issues
 - Add Juno repos
 - Add experimental glance fix, not yet in glance
 - Removed Centos 6 specific workarounds
 - Removed mysql ruby bindings since Centos 7 doesn't have packages for
   it (did we need them?)
 - Use epel module for epel repo management
 - Fix ceilometer dependency