Renaming module to follow style guide

Hi Peter,
As commented in previous emails, the module name doesn't match the regexp defined here: http://docs.puppetlabs.com/puppet/3/reference/lang_reserved.html#classes-and-types

This patch replaces the name in the manifests to "openstack_hyper_v". 

If it's ok for you, merge it and remember to rename the repository to **ppouliot-openstack_hyper_v**

I have other refactoring ready to be updated but I prefer to have this merged before pushing.

Cheers!