s390/zfcpdump: exploit new cio_ignore keywords

Use the 'ipldev' and 'condev' cio_ignore keywords to setup the
command line for zfcpdump.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>