[ISSUE org names not unique in cluster] update open api specs

[StacieClark]

update open api specs for searching for org name to indicate that non-org scoped requests cannot search by name in either find orgnaizations or the list orgs. That org scoped requests that supply a name that does not match thte org will return 404 instead of a empty list

update open api specs to correctly to indicate that a 404 will be returned when a bucket does not exist in cloud as part of our effort to not leak data. Related to this PR https://github.com/influxdata/grace/pull/202