Custom field support missing support for 'datetime', upstream missing in go client

[nneul]

Affected Resource(s)

netbox custom field

Actual Behavior

Module does not support a 'datetime' custom field, only 'date'

Important Factoids

Cannot be fixed until issue addressed in upstream go-netbox client library

References

Upstream client issue: netbox-community/go-netbox#163

[nneul]

Once it's fixed in upstream, most likely just need to add to the list in resource_netbox_custom_field.go:

models.CustomFieldTypeValueDateTime,