Fix uninstall tool + add upgrade task for removing configuration backend

Jean-Noël Rouvignac

06.09.2016 10f0e9c1ad2e1296678c3706152a84437da35a78

 opendj-server-legacy/src/main/java/org/opends/server/tools/upgrade/Upgrade.java

@@ -635,6 +635,10 @@
        rebuildIndexesNamed(INFO_UPGRADE_REBUILD_INDEXES_DISTINGUISHED_NAME.get(),
            "distinguishedName", "member", "owner", "roleOccupant", "seeAlso"));

    register("4.0.0",
        deleteConfigEntry(INFO_UPGRADE_TASK_CONFIGURATION_BACKEND_NOT_CONFIGURABLE.get(),
            "dn: ds-cfg-backend-id=config,cn=Backends,cn=config"));

    /**
     * All upgrades will refresh the server configuration schema and generate a new upgrade folder.
     */