remove-services action deletes useful services

[Shunde Zhang]

The remove-services action deletes a cinder service if its host is not 'cinder' or 'cinder@cinder-ceph'.
Some users use other drivers such as purestorage, netapp etc.

After initial deployment, there is only one backend service in cinder service list.
If that is deleted by the remove-services action, several entries will appear in the list if there are multiple volume services running, which is normal for HA in a production environment. These entries will have the same binary and host, and some may appear to be down, which may trigger alerting system to send out alerts.

This behavior is not right. The remove-services action shouldn't delete useful services.