Delete compute service when deleting compute node

[Andrey Grebennikov]

When we delete the compute node with help of Fuel, it still leaves as the compute service in OpenStack. It becomes marked offline forever or until the administrator deletes it from the database manually.
There are two ways of workaround:
1. There if the API call in Nova (Change-Id: I655a7f818bb59c8971feb5841feeefafc3a4580a) which allow to do it with API call;
2. We may clean the database with the next steps:

mysql -u root -p
use nova;
delete from compute_node_stats where compute_node_id=(select cn.id from compute_nodes cn, services s where cn.service_id=s.id and s.host='hostname');
delete from compute_nodes where service_id=(select id from services where host='hostname');
delete from services where host='hostname';

[Aleksey Kasatkin (alekseyk-ru)]

Does not break deployment. Requires release-notes. Moved to 8.0.