feature: combine root and nonroot secret install; delay chowning

[ryantm]

This simplifies agenix by combining the root and nonRoot secret installation into one place and delays setting the owner and group of the secrets until after the users and groups activation scripts are completed. This also fixes #117 by incorporating the changes from #118 to not switch over the secret directory symlink until after the secrets are decrypted.

This is a breaking change in the sense that someone might have depended on the user or group of a root secret being set before the "users" and "groups" activation scripts run, but that seems unlikely to me.

This is also a breaking change because I renamed a bunch of the activation scripts. I believe these will be module compile-time errors.

cc @jsimonetti

[jsimonetti]

Perhaps it would be wise (considering the possible breaking) to tag a new release before and after merging?

[cole-h]

We should be sure to cut a release before and after this merges, though.

[jsimonetti]

Just curious, is there anything blocking this PR?

[ryantm]

Both those releases have been cut and release notes added. Thanks for the reviews everyone!