fix MinioAdminClient.listCannedPolicies() to return proper string values #1289
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Currently, the returned map when listing all canned policies will return <String, LinkedHashMap> due to the policy (value) being a json blob. There's really no nice way to force jackson to treat it as raw json, thus my suggestion is to just treat it as a JsonNode, which then the user can either convert to a String, or if they've a pojo if they have it.
First commit shows how the unit test fix exposes the failure, and the second commit contains the actual fix.