handle case where bigtable development instances have one node #3057
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The API still doesn't permit setting the node count for development instances, but if we send it as empty it might return 0 or 1 back. Unfortunately, customizediff can't tell that the field isn't set in the config if it is set in state (regardless of whether it's set to computed), so we have to have it allow 1 as a value for num_nodes even though it'll fail at apply-time.
Fixes hashicorp/terraform-provider-google#5492.
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