Detail: fix for an imsm container with a spare

Detail: fix for an imsm container with a spare

Spares for imsm arrays do not have any info about the container in their
metadata records.  If Detail() inadvertantly picks such a device for
->get_array_info() it will end up with less than useful info for the
container.  So, continue to read from the disks until a non-spare device
is found.

This bug was found by timeouts waiting for udev to create the
user-friendly container name.  To detect future UUID reporting problems
and a debug print to the timeout case in wait_for().

Signed-off-by: Dan Williams <dan.j.williams@intel.com>