Fix for OPENDJ-1586: Changes in processSearch to iterate through nested groups members when a search is based on a filter of the isMemberOf attribute.

git-svn-id: https://svn.forgerock.org/opendj/trunk/opends@11090 41b1ffd8-f28e-4786-ab96-9950f0a78031
Fix for OPENDJ-1586: Changes in processSearch to iterate through nested groups members when a search is based on a filter of the isMemberOf attribute.
Additional changes to returnGroupMembers()
- Removed filter param, since it's part of the SearchOperation.
- Changed method to return a boolean to indicate to continue (true) or stop (false) returning entries.
- Added javadoc

git-svn-id: https://svn.forgerock.org/opendj/trunk/opends@11091 41b1ffd8-f28e-4786-ab96-9950f0a78031