public VersionTag getVersionTag() {
    VersionStamp stamp = regionEntry.getVersionStamp();
    if (stamp != null) {
      return stamp.asVersionTag();
    }
    return null;
  }
Used by unit tests. Only available on PR. If, at the time this entry was created, it was
initialized from a local data store then this method returns true.

@since GemFire 6.0
geode-core/src/main/java/org/apache/geode/internal/cache/EntrySnapshot.java