[Ready for Review] after role deactivation stop services and remove HA resources

Once that PR is reviewed and accepted, I can start to finish the feature for the other barclamps as well. 
So please have a look at this one, as it will be similar to the other barclamps.
@aspiers I would implement it that way (with a `services.rb`) file for the other barclamps as well.
In my opinion it would be more consistent, right now we have inconsistent styles of definining attributes for service names.
some barclamps are defined like this:
```ruby
default[:heat][:api][:service_name]
```
compared with neutron
```ruby 
default[:neutron][:platform][:service_name]
```
and for example `cinder` and `glance` don't define a service attribute at all.

And services being a main part of the openstack modules, i thought it would be a good place to start separating attributes into files for clearness. Maybe it would make sense for other things too, like `default[:ha]` attrs.

@mapleoin If you prefer to keep every attribute in `default.rb` I am good with that. We should only look for consistency across barclamps.
What do you think?