@Override
  protected void distributedRegionCleanup(RegionEventImpl event) {
    // No need to close advisor, assume its already closed
    // However we need to remove our listener from the advisor (see bug 43950).
    distAdvisor.removeMembershipListener(advisorListener);
  }
Return serialized form of an entry
<p>
Horribly plagiarized from the similar method in LocalRegion

@param clientEvent holder for the entry's version information
@return serialized (byte) form
@throws IOException if the result is not serializable
@see LocalRegion#get(Object, Object, boolean, EntryEventImpl)
geode-core/src/main/java/org/apache/geode/internal/cache/BucketRegion.java