Added zpool scrub timer/service

zfs-scrub@.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=zpool scrub on %i
+
+[Service]
+Nice=19
+IOSchedulingClass=idle
+KillSignal=SIGINT
+ExecStart=/usr/bin/zpool scrub %i
+
+[Install]
+WantedBy=multi-user.target

zfs-scrub@.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Monthly zpool scrub on %i
+
+[Timer]
+OnCalendar=Sun *-*-1..7 00:00:00
+AccuracySec=1h
+Persistent=true
+
+[Install]
+WantedBy=multi-user.target