Fix violations reported by SonarQube: preserve stacktrace, final class.

Jean-Noel Rouvignac

25.42.2015 26e802d6fa4cb1dddd4764a931169f0be0effd61

 opendj-server-legacy/src/main/java/org/opends/server/backends/pluggable/ID2Entry.java

@@ -91,7 +91,7 @@
   * A cached set of ByteStringBuilder buffers and ASN1Writer used to encode
   * entries.
   */
  private static class EntryCodec
  private static final class EntryCodec
  {
    private static final int BUFFER_INIT_SIZE = 512;