Update puppet-nova & puppet-keystone to use last stable/havana

- keystone: use correct way for logging
- keystone + nova: update ref in Puppetfile & fixtures
- fix unit tests for cloud::compute::hypervisor

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge pull request #424 from enovance/update-modules

Update puppet-nova & puppet-keystone to use last stable/havana