[PATCH] s390: network driver.

[PATCH] s390: network driver.

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

s390 network driver changes:
 - ctc/lcs/qeth: prevent a ccw-device to be grouped multiple times.
 - icuv: clear correct field in iucv_register_program if no userid is specified.
 - lcs: fix online/offline cycle again.
 - lcs: fix ungrouping of lcs group device. The channels of the lcs card
   should be offline afterwards.
 - lcs: don't do netif_stop_queue if no tx buffer is available, just
   return -EBUSY and drop the packets.