Delay device regrouping

DELAYED_GROUPING: YES/NO. If you specify YES, HCD performs any necessary device regrouping after a device group split only when the IODF is closed. This gives a better response time in the HCD dialog for large IODFs.
If you specify NO (which is the default), HCD performs a necessary device regrouping each time when users exit the I/O Device List, or, in case the I/O Device List was called from either the Operating System Configuration List or the Channel Subsystem List, when leaving these lists.