bundles/zfs/files/check_zpool_online: refactor

bundles/zfs/files/check_zpool_online

@@ -1,16 +1,18 @@
 #!/bin/bash
 
-for pool in $(zpool get name -H -o value)
+for result in "$(zpool list -H -o name,health tank)"
 do
-    status=$(zpool get health -H -o value $pool)
-    if [ "$status" != ONLINE ]
+    name=$(cut -f1 <<< $result)
+    health=$(cut -f2 <<< $result)
+
+    if [ "$health" != ONLINE ]
     then
-        errors="$error\"$pool\" status is $status\n"
+        errors="$errors\"$name\" health is \"$health\"\n"
     fi
 done
 
 if [ "$errors" != "" ]
 then
-    echo "CRITICAL - $errors"
+    echo $errors
     exit 2
 fi