Not sure if this is a dup of GRP-4598 or not, but the symptoms are different.

I created a new subject source with the wizard ("testLdap"), intending to replace a hand-crafted configuration (called "ldap"). Marked as disabled in wizard and confirmed by examining the `grouper_config` database table.

After restarting, I can no longer login because it finds duplicate entries:
```edu.internet2.middleware.subject.SubjectNotUniqueException: Found multiple matching subjects: 2, 'wcooley', ldap,testLdap,