Remove more unused opts from nova.scheduler.driver

libvirt_type is unused here since 5b85997

instances_path is unused here since 30aec4a

Change-Id: Ic32775be84b3f46b1d4f117701ebb6e352f1f93c
Add service_destroy to conductor.

This patch adds a service_destroy method to the conductor API.  It is
used from nova.service for deleting the service record in kill().  If a
service has been marked as not having db access, the conductor API will
complete this operation via rpc.

Part of bp no-db-compute.

Change-Id: Ie2397a090290823c0a47aaea41f6900072d142b4
Merge "Add service_destroy to conductor."
Merge "Remove more unused opts from nova.scheduler.driver"