HUE-8330 [cluster] Keep only external cluster configs in [[clusters]]
HUE-8330 [cluster] Keep only external cluster configs in [[clusters]]

Currently we add a [[[Default]]] one to say that we want to say we also want the regular Hue
So basically then we don't need the last [[[Default]]]:

 [[clusters]]

    [[[engines]]]
      type=altus-engines
      hostname=...
      auth_key_id=...
      auth_key_secret=...

    [[[AltusV2]]]
      type=altusv2
      hostname=...
      auth_key_id=...
      auth_key_secret=...

    [[[Default]]]
      type=default
      hostname=...
      auth_key_id=...
      auth_key_secret=...

cloudera/hue,kawamon/hue,kawamon/hue,cloudera/hue,cloudera/hue,kawamon/hue,kawamon/hue,kawamon/hue,kawamon/hue,cloudera/hue,kawamon/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,kawamon/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,kawamon/hue,kawamon/hue,cloudera/hue,kawamon/hue,kawamon/hue,kawamon/hue,kawamon/hue,cloudera/hue,cloudera/hue,kawamon/hue,kawamon/hue,cloudera/hue,kawamon/hue,cloudera/hue,cloudera/hue,kawamon/hue