Update the groupOfNames objectclass to make the member attribute optional, and
update the groupOfUniqueNames objectclass to make the uniqueMember attribute
optional.  This varies from the standard definition in RFC 4519, but it makes
more sense for them to be optional.  It provides better compatibility with the
Sun Java System Directory Server, and it greatly simplifies problems like how
to handle an attempt to delete a user account if referential integrity is
enabled and that user is the last remaining member in a group.

OpenDS Issue Number:  619