DS replication settings: fix regression with <3.3 master
Commit 811b0fdb4620938963f1a29d3fdd22257327562c introduced a regression
when configuring replication with a master < 3.3
Even if 389-ds schema is extended with nsds5ReplicaReleaseTimeout,
nsds5ReplicaBackoffMax and nsDS5ReplicaBindDnGroupCheckInterval
attributes, it will return UNWILLING_TO_PERFORM when a mod
operation is performed on the cn=replica entry.
This patch ignores the error and logs a debug msg.
Reviewed-By: Christian Heimes <firstname.lastname@example.org>