MDL-69271 auth_ldap: Don't assume any ordering, just verify matches

MDL-69271 auth_ldap: Don't assume any ordering, just verify matches

Both ldap or the DB can return information in a non-consistent
ordering leading to events to be generated in different order.

And current tests are, right now, assuming a given order.

Note this is a rare random, but it's happening, so better
fix it, see the issue for some more details.

So we just do the tests ordering immune, verifying that all the
expected events have been triggered and done. Irrespectively of their order.