Output variable subnets_secondary_ranges cannot be used in dependent modules.

[erdebee]

A new bug is introduced into this module, due to the introduction of the following code:
#81

As written in https://www.terraform.io/docs/configuration/data-sources.html#data-resource-dependencies adding a depends_on in a data declaration, the execution of the data value is postponed to the apply phase of terraform.
The created_subnets value is being used in the output of the module for outputting the subnets_secondary_ranges.
We are using the secondary ranges in other modules, as they depend on these ranges (a kubernetes cluster uses secondary ranges for its pods and containers).
Running a terraform plan & apply will now always cause a replacement of the kubernetes cluster, as terraform is not able to find the diff of the state during the plan phase.

To fix this issue we need to get rid of the depends_on in the data block. Perhaps this PR already fixes the issue, but just for 2.x:
#73

Could a patch be created for a 1.4.1 or whatsoever bugfix release?

[morgante]

Thanks for the report, v1.4.1 should fix this.

[jantoebes]

And thank you @morgante for providing a solution so fast :-)