code: public void dropKeyspace() {
          String cqlKeyspace = m_dbservice.getKeyspace();
          m_logger.info("Dropping keyspace: {}", cqlKeyspace);
          StringBuilder cql = new StringBuilder();
          cql.append("DROP KEYSPACE ");
          cql.append(cqlKeyspace);
          cql.append(";");
          executeCQL(cql.toString());
      }
docs: Drop the keyspace for this DBService's tenant. The keyspace is dropped with the
  following CQL command:
  <pre>
  DROP KEYSPACE "<i>keyspace</i>";
  </pre>