Ceilo foodcritic cleanups

FC007: Ensure recipe dependencies are reflected in cookbook metadata: .cookbooks/nova/recipes/ceilometer-api.rb:41
FC007: Ensure recipe dependencies are reflected in cookbook metadata: .cookbooks/nova/recipes/ceilometer-api.rb:42
FC007: Ensure recipe dependencies are reflected in cookbook metadata: .cookbooks/nova/recipes/ceilometer-api.rb:43
FC034: Unused template variables: .cookbooks/nova/templates/default/ceilometer.conf.erb:1