Allow allocating to non-active hosts with dynamic provisioning

[freva]

With dynamic provisioning, we can allocate a container to a host that already has node(s) by this tenant as long as that host is active. Because we prepare for each ClusterSpec separately, we will end up provisioning new hosts just for the logserver container, since any host just provisioned for a container/content node is still in provisioned. This PR relaxes that requirement:
For non-dynamic provisioning: No change (host must still be active)
For dynamic provisioning: Host can be any of provisioned, ready or active.

Not sure if this is possible, but ideally we should make sure that logserver is prepared last since it is most likely to be able to fit on any previously provisioned host.

[hmusum]

LGTM.

FWIW, looks like AdminModel (which creates logserver) depends on ContainerModel and Content depends on both AdminModel and ContainerModel. So logserver will be prepared after container clusters, but before content clusters.