(ITS#5157) dynlist shouldn't populate values unless requested

Full_Name: Howard Chu Version: 2.4/HEAD OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (63.193.240.128) Submitted by: hyc Since populating the member list in a dynamic group may be a very expensive operation, the dynlist overlay should not perform this work if the member attribute wasn't requested in the search parameters. Already fixed in HEAD.