Now when -upgrade is provided to "terraform init" (and plugin installation
isn't disabled) it will:
- ignore the contents of the auto-install plugin directory when deciding
what is "available", thus causing anything there to be reinstalled,
possibly at a newer version.
- if installation completes successfully, purge from the auto-install
plugin directory any plugin-looking files that aren't in the set of
chosen plugins.
As before, plugins outside of the auto-install directory are able to
take precedence over the auto-install ones, and these will never be
upgraded nor purged.
The thinking here is that the auto-install directory is an implementation
detail directly managed by Terraform, and so it's Terraform's
responsibility to automatically keep it clean as plugins are upgraded.
We don't yet have the -plugin-dir option implemented, but once it is it
should circumvent all of this behavior and just expect providers to be
already available in the given directory, meaning that nothing will be
auto-installed, -upgraded or -purged.
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