Show DELAYED, PENDING status of resync process in "--detail"

Show DELAYED, PENDING status of resync process in "--detail"

Initially there is no proper translation mdstat's DELAYED/PENDING processes
to "--detail" output.
For example, if we have recover=DELAYED in mdstat, "--detail"
shows "State: recovering" and "Rebuild Status = 0%".
It was incorrect in case of process waiting on checkpoint different
than 0%. In fact rebuild status is differnt than 0% and user is misled.

The patch fix the problem. Current "--detail" command shows
in the exampe: "State: recovering (DELAYED)" and no information
about precentage.

Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>