HRCPP-98 Add more methods to the SWIG layer:
  - ServerStatistics stats()
  - boolean replaceWithVersion(K key, V newValue, long version);
  - boolean replaceWithVersion(K key, V newValue, long version, int lifespanSeconds);
  - boolean replaceWithVersion(K key, V newValue, long version, int lifespanSeconds, int maxIdleTimeSeconds);
  - boolean removeWithVersion(K key, long version);

Make JniTest much simpler by using the TestNG APIs.
Test against 6.0.0.Final artifacts