`dataset.metadata.fields` return both `creation_dt` and `creation_time`.

[pindge]

Expected behaviour

return either creation_time or creation_dt as they are the same fields

Actual behaviour

{'creation_time': datetime.datetime(2012, 1, 1, 0, 0),
 'format': 'GeoTIFF',
 'label': None,
 'lat': Range(begin=-20.000103279534002, end=-15.999825404949501),
 'lon': Range(begin=137.9997761436025, end=144.000054066587),
 'time': Range(begin=datetime.datetime(2000, 2, 1, 0, 0, 1, tzinfo=datetime.timezone.utc), end=datetime.datetime(2008, 3, 31, 23, 59, 59, 999999, tzinfo=datetime.timezone.utc)),
 'platform': None,
 'instrument': None,
 'product_type': 'aster_false_colour',
 'id': '64a0a0ac-78c4-4b0a-a65a-b51d83362cbc',
 'sources': {},
 'creation_dt': '2012-01-01',
 'grid_spatial': {'geo_ref_points': {'ll': {'x': 137.9997761436025,
    'y': -20.000103279534002},
   'lr': {'x': 144.000054066587, 'y': -20.000103279534002},
   'ul': {'x': 137.9997761436025, 'y': -15.999825404949501},
   'ur': {'x': 144.000054066587, 'y': -15.999825404949501}},
  'spatial_reference': 'EPSG:4283'},
 'measurements': {'Band_1': {'path': 'SE54_False_Colour_Band1.tif',
   'layer': '1'},
  'Band_2': {'path': 'SE54_False_Colour_Band2.tif', 'layer': '1'},
  'Band_3': {'path': 'SE54_False_Colour_Band3.tif', 'layer': '1'}}}

Steps to reproduce the behaviour

from datacube import Datacube
dc = Datacube()
dataset= dc.index.datasets.get("64a0a0ac-78c4-4b0a-a65a-b51d83362cbc")
dataset.metadata.fields

Environment information

• Which datacube --version are you using?

jovyan@jupyter-pin-2ejin-40ga-2egov-2eau:~$ datacube --version
Open Data Cube core, version 1.8.6

• What datacube deployment/environment are you running against? dea sandbox

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