Update puppet-ceph to the last commit.

In order to use these changes:
https://github.com/enovance/puppet-ceph/commit/a9d9dacc464cfc7f8d157e71fef753894df08b1e
Update Puppetfile and .fixtures.yaml
Merge pull request #643 from AlexandreNo/master

Update puppet-ceph to the last commit.