Switch the callers to the standard Maintenance::waitForReplication() method.
Avoid using LoadBalancer::waitFor(), which will made internal soon.
Bug: T326274
Change-Id: Idf0562eb33d90ff70eb3a7d5d7f54da944423d27
Generally applicable, but intended for users affected by the
login-success phantom notifications bug.
Bug: T220762
Change-Id: Ica428bfc19e0555564ca04d80ac5009197401aaf