MFC r278479,278494,278525,278545,278592,279237,280410:

This change merges devctl notification for userland coredumps.

r278479 (rpaulo):

Notify devd(8) when a process crashed.

This change implements a notification (via devctl) to userland when
the kernel produces coredumps after a process has crashed.
devd can then run a specific command to produce a human readable crash
report. The command is most usually a helper that runs gdb/lldb
commands on the file/coredump pair. It's possible to use this
functionality for implementing automatic generation of crash reports.

devd(8) will be notified of the full path of the binary that crashed and
the full path of the coredump file.

r278494 (rpaulo):

Sanitise the coredump file names sent to devd.

While there, add a sysctl to turn this feature off as requested by kib@.

r278525 (rpaulo):

Remove a printf and an strlen() from the coredump code.

r278545 (rpaulo):

Restore the data array in coredump(), but use a different style to
calculate the length.

r278592 (rpaulo):

Remove check against NULL after M_WAITOK.

r279237 (kib):

Keep a reference on the coredump vnode for vn_fullpath() call. Do it
by moving vn_close() after the point where notification is sent.

r280410 (rpaulo):

Disable coredump_devctl because it could lead to leaking paths to jails.

Approved by: re

MFC r314341:

Update devd.conf for ports change 421360

Ports change 421360 changed the name and UID of the postgres user

Reviewed by: trasz, imp, girgen
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D9746

MFC r285675:

Remove a comment in the wrong place.

Sponsored by: The FreeBSD Foundation

MFC r277171:

Use newly added GEOM notifications to discard autofs caches.

Sponsored by: The FreeBSD Foundation

MFC r275681:

Add "-media" autofs map, to access data on removable media, such as CD
drives or flash keys. It can be enabled by uncommenting a single entry
in default /etc/auto_master. It can also be easily modified to use
fuse-based filesystems instead of in-kernel ones.

There is still one deficiency - the mountpoints are permanent, they
don't disappear when user removes the media. Fixing it needs some
autofs changes.

Relnotes: yes
Sponsored by: The FreeBSD Foundation

MFC r261894: move devd rules for zfs events into a separate file

... and fix stale event types

MFC r261260, r261262, r261315 and r261343:
Add support for trackpads found in Apple MacBook products. While at it
add some missing devd entries.

MFC r285675:

Remove a comment in the wrong place.

Sponsored by: The FreeBSD Foundation

MFC r277171:

Use newly added GEOM notifications to discard autofs caches.

Sponsored by: The FreeBSD Foundation

MFC r275681:

Add "-media" autofs map, to access data on removable media, such as CD
drives or flash keys. It can be enabled by uncommenting a single entry
in default /etc/auto_master. It can also be easily modified to use
fuse-based filesystems instead of in-kernel ones.

There is still one deficiency - the mountpoints are permanent, they
don't disappear when user removes the media. Fixing it needs some
autofs changes.

Relnotes: yes
Sponsored by: The FreeBSD Foundation

MFC r261894: move devd rules for zfs events into a separate file

... and fix stale event types

MFC r261260, r261262, r261315 and r261343:
Add support for trackpads found in Apple MacBook products. While at it
add some missing devd entries.