Ensure the JMX purge authorizable actions never purge system groups/users

[ghenzler]

At the moment the fragment [1] works to set an ACL for the group everyone for applying

The JMX methods to purge authorizables (e.g. purgeAllAuthorizablesFromConfiguration()) should properly deal with everyone and unmanagedAcePathsRegex settings

[1]

- group_config:
    - everyone:
        - unmanagedAcePathsRegex: /(?!apps/myproj/login).*

- ace_config:

    - everyone:
        - path: /apps/myproj/login
          permission: allow
          privileges: jcr:read