Instead of blanket-marking managed BU hosts, now parses the Atlas API
response: if it returns a valid {active, inactive} structure, the host
is known. If it returns an error or 'not found' message (even with a
2xx status), the host is not known and won't show a badge.
This prevents the shield showing on hosts Atlas doesn't actually track,
while correctly showing it on hosts Atlas recognizes (with or without
plans).
c0e3139503
