Fix test names
ISPN-3422 In non-tx caches, write operations may not be atomic during rebalance

* Replace the ignorePreviousValue flag with a ValueMatchingPolicy enum.
* Set the matching policy to MATCH_EXPECTED_OR_NEW when retrying a
  putIfAbsent(k, value).
* Regular put(k, value) still won't be atomic, because we don't keep the
  previous value around.
* replace(k, expected, newValue) and remove(k, expected) will also be
  retried with MATCH_EXPECTED_OR_NEW.
* Same as regular put(k, value), replace(k, newValue) and remove(k) won't
  be atomic.