OPENDJ-1932 CR-6839 Improve management context API
Great thanks to JNR!
Here is the CR thread link: http://sources.forgerock.org/cru/CR-6839#c74225
* org.forgerock.opendj.config.client.DriverBasedManagementContext
** Old ManagementContext abstract class. It represents now a driver based management context.
** No other changes in this file
* org.forgerock.opendj.config.client.ManagementContext
** Changed to interface
* org.forgerock.opendj.config.client.ldap.LDAPManagementContext
** Add inner wrapper class which allow close() method overwrite.
* org.opends.guitools.controlpanel.ui.AbstractIndexPanel
* org.opends.guitools.controlpanel.ui.AbstractVLVIndexPanel
* org.opends.guitools.controlpanel.ui.NewBaseDNPanel
* org.opends.server.tools.BackendCreationHelper
** Consequences of this API change + refactoring