Metric::Target capture_cloud_targets rewrite
Metric::Target capture_cloud_targets rewrite

- only bring back vms that are on (when availability_zone.nil?)
- only bring back vms that have an ems

https://bugzilla.redhat.com/show_bug.cgi?id=1332579
https://bugzilla.redhat.com/show_bug.cgi?id=1331803
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