@Deprecated
  public OperationFuture<Boolean> delete(String key, int hold) {
    return delete(key);
  }
Delete the given key from the cache.

<p>
The hold argument specifies the amount of time in seconds (or Unix time
until which) the client wishes the server to refuse "add" and "replace"
commands with this key. For this amount of item, the item is put into a
delete queue, which means that it won't possible to retrieve it by the
"get" command, but "add" and "replace" command with this key will also fail
(the "set" command will succeed, however). After the time passes, the item
is finally deleted from server memory.
</p>

@param key the key to delete
@param hold how long the key should be unavailable to add commands

@return whether or not the operation was performed
@deprecated Hold values are no longer honored.
src/main/java/net/spy/memcached/MemcachedClient.java