move manpage arcstat(1) to arcstat(8).

Adapted from debian upstream [0] commits:
1a3239e6b3b5604bb588c10912f57f32962b38c3
66b7241c965cdce730e76ca59c242fccc267b302

[0] https://salsa.debian.org/zfsonlinux-team/zfs/
Originally-By: Mo Zhou <cdluminate@gmail.com>
Originally-By: Antonio Russo <aerusso@aerusso.net>
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/patches/0009-Patch-move-manpage-arcstat-1-to-arcstat-8.patch

@@ -0,0 +1,54 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Stoiko Ivanov <s.ivanov@proxmox.com>
+Date: Thu, 4 Feb 2021 19:01:12 +0100
+Subject: [PATCH] Patch: move manpage arcstat(1) to arcstat(8).
+
+Originally-By: Mo Zhou <cdluminate@gmail.com>
+Originally-By: Antonio Russo <aerusso@aerusso.net>
+
+Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
+---
+ man/man1/Makefile.am                   | 2 +-
+ man/man8/Makefile.am                   | 1 +
+ man/{man1/arcstat.1 => man8/arcstat.8} | 2 +-
+ 3 files changed, 3 insertions(+), 2 deletions(-)
+ rename man/{man1/arcstat.1 => man8/arcstat.8} (99%)
+
+diff --git a/man/man1/Makefile.am b/man/man1/Makefile.am
+index 8d7457a3e..101af7b6c 100644
+--- a/man/man1/Makefile.am
++++ b/man/man1/Makefile.am
+@@ -1,4 +1,4 @@
+-dist_man_MANS = zhack.1 ztest.1 raidz_test.1 zvol_wait.1 arcstat.1
++dist_man_MANS = zhack.1 ztest.1 raidz_test.1 zvol_wait.1
+ EXTRA_DIST = cstyle.1
+ 
+ if BUILD_LINUX
+diff --git a/man/man8/Makefile.am b/man/man8/Makefile.am
+index 07f6aefa6..a757b1c62 100644
+--- a/man/man8/Makefile.am
++++ b/man/man8/Makefile.am
+@@ -1,6 +1,7 @@
+ include $(top_srcdir)/config/Substfiles.am
+ 
+ dist_man_MANS = \
++	arcstat.8 \
+ 	fsck.zfs.8 \
+ 	mount.zfs.8 \
+ 	vdev_id.8 \
+diff --git a/man/man1/arcstat.1 b/man/man8/arcstat.8
+similarity index 99%
+rename from man/man1/arcstat.1
+rename to man/man8/arcstat.8
+index ca508b49c..0aa81849a 100644
+--- a/man/man1/arcstat.1
++++ b/man/man8/arcstat.8
+@@ -13,7 +13,7 @@
+ .\" Copyright (c) 2015 by Delphix. All rights reserved.
+ .\" Copyright (c) 2020 by AJ Jordan. All rights reserved.
+ .\"
+-.TH ARCSTAT 1 "Oct 20, 2020" OpenZFS
++.TH ARCSTAT 8 "Oct 20, 2020" OpenZFS
+ .SH NAME
+ arcstat \- report ZFS ARC and L2ARC statistics
+ .SH SYNOPSIS

debian/patches/series

@@ -6,3 +6,4 @@
 0006-dont-symlink-zed-scripts.patch
 0007-Use-installed-python3.patch
 0008-Add-systemd-unit-for-importing-specific-pools.patch
+0009-Patch-move-manpage-arcstat-1-to-arcstat-8.patch

debian/zfsutils-linux.install

@@ -33,7 +33,7 @@ usr/sbin/arc_summary
 usr/sbin/arcstat
 usr/sbin/dbufstat
 usr/share/bash-completion/completions
-usr/share/man/man1/arcstat.1
+usr/share/man/man8/arcstat.8
 usr/share/man/man1/zhack.1
 usr/share/man/man1/zvol_wait.1
 usr/share/man/man5/