Reorganize zpool(8) man page into sections

Moved subcommand topics into individual manpages. Reordered and 
grouped the list of subcommands by topic.

Moved concepts overview to `zpoolconcepts.8` and the long list of
available pool properties to `zpoolprops.8`.

Internal cross-references copied from `zpool.8` needed to be 
converted to `.Xr` external references to new subcommand manual 
pages.

Move `autotrim` into lexical order, autotrim tacked onto the end
of a list. Now it is in alphabetical order.

Clarify attach/detach description. Description was too specific to
command syntax. Overview clarifies reason for attaching or detaching
a device.

Clarify replace description, don't refer to subcommand arguments.

Clarify split command description, say what split actually does and
why you'd want to do it.

Clarify description of upgrade, and simplify the zpool.8 wording of
the zpool-upgrade(8) description.

Clarify description of import, detail what zpool-import(8) actually 
does.

Add appropriate SEE ALSO sections. Divided zpool subcommand manual 
pages need their own SEE ALSO sections. Also modified fsck.zfs.8 
to point directly to zfs-scrub.8 and zed.8.in to include a direct
reference to zfs-events.8

Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Kjeld Schouten <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ross Williams <[email protected]>
Closes #9564 

1 files changed, 112 insertions, 0 deletions

diff --git a/man/man8/zpool-wait.8 b/man/man8/zpool-wait.8
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+.\"
+.\" CDDL HEADER START
+.\"
+.\" The contents of this file are subject to the terms of the
+.\" Common Development and Distribution License (the "License").
+.\" You may not use this file except in compliance with the License.
+.\"
+.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+.\" or http://www.opensolaris.org/os/licensing.
+.\" See the License for the specific language governing permissions
+.\" and limitations under the License.
+.\"
+.\" When distributing Covered Code, include this CDDL HEADER in each
+.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+.\" If applicable, add the following below this CDDL HEADER, with the
+.\" fields enclosed by brackets "[]" replaced with your own identifying
+.\" information: Portions Copyright [yyyy] [name of copyright owner]
+.\"
+.\" CDDL HEADER END
+.\"
+.\"
+.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
+.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
+.\" Copyright (c) 2017 Datto Inc.
+.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
+.\" Copyright 2017 Nexenta Systems, Inc.
+.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
+.\"
+.Dd August 9, 2019
+.Dt ZPOOL-WAIT 8
+.Os Linux
+.Sh NAME
+.Nm zpool Ns Pf - Cm wait
+.Nd Wait for background activity to stop in a ZFS storage pool
+.Sh SYNOPSIS
+.Nm
+.Cm wait
+.Op Fl Hp
+.Op Fl T Sy u Ns | Ns Sy d
+.Op Fl t Ar activity Ns Oo , Ns Ar activity Ns Oc Ns ...
+.Ar pool
+.Op Ar interval
+.Sh DESCRIPTION
+.Bl -tag -width Ds
+.It Xo
+.Nm
+.Cm wait
+.Op Fl Hp
+.Op Fl T Sy u Ns | Ns Sy d
+.Op Fl t Ar activity Ns Oo , Ns Ar activity Ns Oc Ns ...
+.Ar pool
+.Op Ar interval
+.Xc
+Waits until all background activity of the given types has ceased in the given
+pool.
+The activity could cease because it has completed, or because it has been
+paused or canceled by a user, or because the pool has been exported or
+destroyed.
+If no activities are specified, the command waits until background activity of
+every type listed below has ceased.
+If there is no activity of the given types in progress, the command returns
+immediately.
+.Pp
+These are the possible values for
+.Ar activity ,
+along with what each one waits for:
+.Bd -literal
+        discard       Checkpoint to be discarded
+        free          'freeing' property to become 0
+        initialize    All initializations to cease
+        replace       All device replacements to cease
+        remove        Device removal to cease
+        resilver      Resilver to cease
+        scrub         Scrub to cease
+.Ed
+.Pp
+If an
+.Ar interval
+is provided, the amount of work remaining, in bytes, for each activity is
+printed every
+.Ar interval
+seconds.
+.Bl -tag -width Ds
+.It Fl H
+Scripted mode.
+Do not display headers, and separate fields by a single tab instead of arbitrary
+space.
+.It Fl p
+Display numbers in parsable (exact) values.
+.It Fl T Sy u Ns | Ns Sy d
+Display a time stamp.
+Specify
+.Sy u
+for a printed representation of the internal representation of time.
+See
+.Xr time 2 .
+Specify
+.Sy d
+for standard date format.
+See
+.Xr date 1 .
+.El
+.El
+.Sh SEE ALSO
+.Xr zpool-status 8 ,
+.Xr zpool-checkpoint 8 ,
+.Xr zpool-initialize 8 ,
+.Xr zpool-replace 8 ,
+.Xr zpool-remove 8 ,
+.Xr zpool-resilver 8 ,
+.Xr zpool-scrub 8