File zfs-import-scan.patch of Package zfs

--- etc/systemd/system/zfs-import-scan.service.in	2018-09-06 02:20:31.000000000 +0200
+++ ../patch/zfs-import-scan.service.in	2018-09-08 13:17:17.428035858 +0200
@@ -12,7 +12,7 @@ ConditionPathExists=!@sysconfdir@/zfs/zp
 Type=oneshot
 RemainAfterExit=yes
 ExecStartPre=-/sbin/modprobe zfs
-ExecStart=@sbindir@/zpool import -aN -o cachefile=none
+ExecStart=@sbindir@/zpool import -f -aN -o cachefile=none
 
 [Install]
 WantedBy=zfs-import.target