code: public ImmutableMap<String, String> getConfigurationTweak(String dbModuleName)
      {
          final DbInfo db = cluster.getNextDb();
          return ImmutableMap.of("ness.db." + dbModuleName + ".uri", getJdbcUri(db),
                                 "ness.db." + dbModuleName + ".ds.user", db.user);
      }
docs: Return configuration tweaks in a format appropriate for ness-jdbc DatabaseModule.