Allow drush sa to still work

[hanoii]

Without this, the policy will try to validate ${env-name} as a valid hostname and will failed, and the command drush sa will return the error and no aliases.

[greg-1-anderson]

I guess that ${env-name} is already replaced in most instances, but is not replaced when running drush sa?

The drush 9 version of this policy file will also need to be similarly adjusted.

[hanoii]

@greg-1-anderson correct, I actually just tried and this on a few drush 9 sites with different versions and there it works just fine. drush actually replaces ${env-name} for * and the policy is not even run so no need to update the policy. This could also be a drush "bug", but maybe easier to also fix here?