The JSON plan output format includes a serialized, simplified version of
the configuration. One component of this config is a map of provider
configurations, which includes version constraints.
Until now, only version constraints specified in the provider config
blocks were exposed in the JSON plan output. This is a deprecated method
of specifying provider versions, and the recommended use of a
required_providers block resulted in the version constraints being
omitted.
This commit fixes this with two changes:
- When processing the provider configurations from a module, output the
fully-merged version constraints for the entire module, instead of any
constraints set in the provider configuration block itself;
- After all provider configurations are processed, iterate over the
required_providers entries to ensure that any configuration-less
providers are output to the JSON plan too.
No changes are necessary to the structure of the JSON plan output, so
this is effectively a semantic level bug fix.