configuration.detect.errors does more than what documentation/base config says

Hello,

While upgrading from 2.2.2 to 2.4.0 I had errors about missing attributes 'etc:attribute:attestation:attestation' and 'etc:attribute:instrumentationData:instrumentationDataInstances'. It took me some time to find this page https://todos.internet2.edu/si/jira.issueviews:issue-html/GRP-1921/GRP-1921.html that suggests 'configuration.detect.errors' configuration parameter might be the solution.

After setting 'configuration.detect.errors' to true and restarting grouper, the grouper_error.log shows missing attributes have been created.

The current grouper.base.properties says:
```
#if grouper should try and detect and log configuration errors on startup
#in general this should be true, unless the output is too annoying or if it is causing a problem

1. {valueType: "boolean", required: true}
   configuration.detect.errors = true
   ```

It REALLY should also tell this configuration parameter is required during upgrade process.