Move run_instance compute to BDM objects

This patch moves the run_instance code of the compute service to BDM
objects.

This is the last bit of compute that needed migrating to BDM objects.

Part of blueprint: icehouse-objects

Change-Id: I055651b5fd415092787d9487a69467a9bbcf073e
Merge "Move run_instance compute to BDM objects"