set_config
Description:
Sets the configuration of the pool.
If the pool is already configured, and the configuration hasn't changed, this function will return true. If the pool is active, this method will return false and active configuration will remain. Buffers allocated from this pool must be returned or else this function will do nothing and return false.
config is a Structure that contains the configuration parameters for
       the pool. A default and mandatory set of parameters can be configured with 
      config_set_params, 
      config_set_allocator and 
      config_add_option.
If the parameters in config can not be set exactly, this function returns false and will try to 
      update as much state as possible. The new state can then be retrieved and refined with 
      get_config.
This function takes ownership of config.
Parameters:
| this | |
| config | 
Returns:
| 
           true when the configuration could be set.  |