Ceph Dumpling is LTS release, it should be used instead of Emperor.

  The next stable/LTS release is going to be Firefly.
* CentOS is now using the CentOS repo instead of RHEL6 repo.
* RHEL is now using the RHEL6.4 repo instead of RHEL6.
* Added the ceph-extras repo for all. This includes needed packages
  that do not come (or are too old) on their specific distro.
* For RPM repos naming has been corrected and priorities added.
* Package name for the Google Perftools is corrected.

Signed-off-by: JuanJose 'JJ' Galvez <jj.galvez@inktank.com>
Moved role constraints into model and removed edit deployment
Merge pull request #33 from tboerger/feature/constraint-move

Moved role constraints into model and removed edit deployment
Merge pull request #31 from jgalvez/pull-req-release-stoney-master-1b7764d51b88e188e2b85d7dc67f826f1ca66f55

Switch Ceph to use Dumpling, Fix Packages/Repos [1/1]
Removed the single assignment block from constraints

(cherry picked from commit 092336cf1dba3aae4311618eb2e37e4d2ba91a16)
Merge pull request #36 from vuntz/release/stoney/master

Removed the single assignment block from constraints