Allow setting num_nodes for DEVELOPMENT clusters

[Legogris]

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Terraform Version

Terraform v0.11.14
+ provider.google v2.8.0

Affected Resource(s)

• google_bigtable_instance

We have previously been able to use the same module for prod and development and templating in values for number of nodes, type, etc, that differs between environments. As of #2401 / GoogleCloudPlatform/magic-modules#679, we can no longer reuse templates in this way, so it is a breaking change for us (since we can't have fields optionally unset). I'd prefer being able to set num_nodes to 1 for development instances only.

Alternatively, make instance_type required to avoid the scenario motivating GoogleCloudPlatform/magic-modules#679

[rileykarson]

Hey @Legogris!

You're correct that this was a breaking change- it was made as part of a major release, 2.0.0. num_nodes not being able to be set for DEVELOPMENT instances improves the validation of the resource, so I'm not sure it's a change I'd like to revert either. Additionally, this is solved entirely by using Terraform 0.12 instead of Terraform 0.11, where conditionally setting fields is possible.

Setting instance_type to Required would be another breaking change, so that's not really feasible.

[ghost]

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