* Change error messages in UI during LDAP login (PROJQUAY-4845)
Previously, on installations where LDAP is used, we were telling users whether the username or password was failing when login attempts were made. This might pose a security risk, a malicious user could, via the returned message, identify which users have access to Quay and which don't.
With this change, we return a general message saying the user used wrong credentials instead of providing any details.
* Fixed tests.
* Fix some more tests.
* Readd accidental removal of one assertion.
- Similar to LDAP_SUPERUSER_FILTER, add a specific filter to define
restricted users, based on the LDAP_USER_FILTER
- restrict writes on restricted users' own namespace. Normal
permissions applies on organization membership
- add global readonly superuser GLOBAL_READONLY_SUPER_USERS (PROJQUAY-2604)
- Removes RESTRICTED_USER_INCLUDE_ROBOTS, FEATURE_RESTRICTED_READ_ONLY_USERS
