@Override
      public Map<String, String> getHiveVariable() {
        return null;
      }
Generates a unique test path for this particular CliDriver in the following form:
  ${test.blobstore.path}/CoreBlobstore[Negative]CliDriver/20160101.053046.332-{random number 000-999}
20160101.053046.332 represents the current datetime:
  {year}{month}{day}.{hour}{minute}{second}.{millisecond}
Random integer 000-999 included to avoid collisions when two test runs are started at the same millisecond with
 the same ${test.blobstore.path} (possible if test runs are controlled by an automated system)
itests/util/src/main/java/org/apache/hadoop/hive/cli/control/AbstractCoreBlobstoreCliDriver.java