OPENDJ-1571 Internal Error when doing REST operations on HTTP Connection Handler


As pointed out by Ludo, problem is due to an API change in InternalClientConnection.processSearch() where LinkedHashSets parameters have been replaced with Set.
Reverted revision r9082 which introduced the problem.

Changed all client code to use LinkedHashSets instead of Sets.


CollectionUtils.java:
Added missing methods implemented in TestCaseUtils.

TestCaseUtils.java, LDAPReplicationDomain.java:
Removed generic methods creating collections.