Fix CHEF-3694 caused by bad resource naming

Two resources have the same name, which leads to:

WARN: Cloning resource attributes for keystone_register[register keystone service] from prior resource (CHEF-3694)
WARN: Previous keystone_register[register keystone service]: /var/chef/cache/cookbooks/keystone/recipes/server.rb:340:in `from_file'
WARN: Current  keystone_register[register keystone service]: /var/chef/cache/cookbooks/keystone/recipes/server.rb:352:in `from_file'
Merge pull request #83 from vuntz/fix-CHEF-3694

Fix CHEF-3694 caused by bad resource naming