check_mk-zpool_status: fixed check crash in case of zfs pools with sp…

[phreaker0]

…ecial devices and errors

General information

the current zpool_status check crashes for the following zpool:

  pool: storage
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-9P
  scan: scrub repaired 0B in 00:54:14 with 0 errors on Mon May 30 22:52:10 2022
config:

        NAME                                                   STATE     READ WRITE CKSUM
        storage                                                ONLINE       0     0     0
          mirror-0                                             ONLINE       0     0     0
            ata-ST2000VM003-1CT164_W1H3SR9H                    ONLINE       0     0     0
            ata-TOSHIBA_DT01ACA200_94RRPEVAS                   ONLINE       0     0     0
        special 
          mirror-2                                             ONLINE       0     0     0
            ata-Samsung_SSD_860_QVO_1TB_S4CZNF0N459001M-part3  ONLINE       0     5     0
            ata-Samsung_SSD_860_QVO_1TB_S4CZNF0N458919M-part3  ONLINE       0     0     0
        logs
          mirror-1                                             ONLINE       0     0     0
            ata-Samsung_SSD_860_QVO_1TB_S4CZNF0N459001M-part1  ONLINE       0     0     0
            ata-Samsung_SSD_860_QVO_1TB_S4CZNF0N458919M-part1  ONLINE       0     0     0
        cache
          ata-Samsung_SSD_860_QVO_1TB_S4CZNF0N459001M-part2    ONLINE       0     0     0
          ata-Samsung_SSD_860_QVO_1TB_S4CZNF0N458919M-part2    ONLINE       0     0     0

errors: No known data errors

OS: Debian GNU/Linux 11 (bullseye)
ZFS: 2.1.4

Crash Report: crash.info.txt

Proposed changes

Add the "special" top level device, which was introduced with zfs 0.8.x (openzfs/zfs#5182), to the parsing logic.