applier doesn't consider hypervisor type

[semen]

When we have several different hypervisors running under one Openstack environment, watcher audit can be successfully performed but an action plan can not be fully executed because watcher applier tries to live migrate instances to unsupported hypervisor.

My current hypervisors: KVM, XEN, Hyper-V.
All VMs are running on KVM nodes. Watcher tries to migrate to XEN.

2018-06-19 19:25:20.191 4410 ERROR watcher.applier.workflow_engine.default BadRequest: Unable to migrate instance (e46d04bd-f826-4d1f-b351-a6c5ffa863a2) to current host (ovm2.openstack.local).

We need to have an ability to limit basic cluster model per availability zones or build cluster model considering exact hypervisor type.

[Alexander Chadin (joker946)]

Semen, you can use scope of audit template to define both host_aggregates or availability_zones scopes. See more here: https://github.com/openstack/python-watcherclient/blob/master/watcherclient/v1/audit_template_shell.py#L165