dasd_ioctl: fallback to format device node manually

libudev might fail to return a device node, in which case we'll
need to format it manually.

Signed-off-by: Hannes Reinecke <hare@suse.de>
monitor_testcase_14: disk quiesce/resume

Add new testcase for disk quiesce and resume.

Signed-off-by: Hannes Reinecke <hare@suse.de>
md_monitor: unset failfast for degraded mirror

When a mirror becomes degraded we need to unset the 'failfast'
setting for the DASD. Otherwise a failure on the other half
will trigger an I/O error when writing to the mirror instead
of waiting until the mirror becomes useable again.

Signed-off-by: Hannes Reinecke <hare@suse.de>