Bug description: If an invalid value is set to ds5BeginReplicaRefresh
in an agreement, it does not affect the behaviour, but it does not get
purged from the agreement and causes an error if "ds5BeginReplicaRefresh:
start" is added.
Fix description: Adding an invalid ds5BeginReplicaRefresh is rejected
with "DSA is unwilling to perform" and the following error is returned:
ldap_modify: additional info: Invalid value (junk_value123) value
supplied for attr (nsds5BeginReplicaRefresh); Ignoring ...