Fixes #66 /admin/listclients with URL auth #67
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Normally the /admin/listclients?mountpoint=/stream URL is accessible by authenticating with the
<source-password>(when not using Mountpoint Authentication. However when specifying<authentication type="url">with thestream_authoption the end-point returns403 Forbiddenwith "Mountpoint in use".This PR correctly detects /admin/listclients as a source admin request and fixes #66