MFC r250968:

  Mention the "nojailvnet" keyword.
Preparation for MFC revs r248291 and r249741:

Add 'list' command, for now the exact equivalent of 'status',
so users of the latter could change their scripts.

This is direct commit to stable, and is temporary.

Requested by:	Pete French <petefrench@ingresso.co.uk>
Approved by:	trociny
2B cleaned after:	6 weeks
MFC of 250708:

Clean up trailing whitespace.

Submitted by: Andy Kosela

MFC of 250710:

When running the -m option to generate a newfs(8) command suitable for
recreating the filesystem, check for and output the -i, -k, and -l
options if appropriate.

Note the remaining deficiencies of the -m option in the dumpfs(8)
manual page. Specifically that newfs(8) options -E, -R, -S, and -T
options are not handled and that -p is not useful so is omitted.
Also document that newfs(8) options -n and -r are neither checked
for nor output but should be. The -r flag is needed if the filesystem
uses gjournal(8).

PR:           bin/163992
Reported by:  Dieter <freebsd@sopwith.solgatos.com>
Submitted by: Andy Kosela <akosela@andykosela.com>
MFC r250849:
Add ddb command 'show pginfo'.
MFC r250850:
Add amd64-specific ddb command 'show phys2dmap'.
MFC r250851:
Fix the hardware watchpoints on SMP amd64.
MFC r250853:
Fix the wait6(2) on 32bit architectures and for the compat32, by using
the right type for the argument in syscalls.master.  Also fix the
posix_fallocate(2) and posix_fadvise(2) compat32 syscalls on the
architectures which require padding of the 64bit argument.
Regenerate.
Merge remote-tracking branch 'upstream/stable/9' into stable/9