Remove unused imports

Jean-Noel Rouvignac

20.17.2015 70b1a5d519ed725d30f30aba931adfd15e9cfc66

 opendj-server-legacy/src/main/java/org/opends/server/backends/NullBackend.java

@@ -26,7 +26,6 @@
 */
package org.opends.server.backends;

import static org.forgerock.util.Reject.*;
import static org.opends.messages.BackendMessages.*;
import static org.opends.server.util.ServerConstants.*;
import static org.opends.server.util.StaticUtils.*;