Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Merge ^/head r318658 through r318963.

Fix long standing issue in bsdconfig's keymap selection

Since the translation to vt as terminal emulator, the keymaps files
path has changed and this change does not get followed in bsdconfig.
This

Fix long standing issue in bsdconfig's keymap selection

Since the translation to vt as terminal emulator, the keymaps files
path has changed and this change does not get followed in bsdconfig.
This implicates boot time warnings about a wrong keymap file, what
is very confusing for the new users and for me too, so initialize
the default keymaps search path depending on terminal type.

Differential Revision: https://reviews.freebsd.org/D8734
Submitted by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
Reviewed by: ed, jilles, dteske
MFC after: 3 days
X-MFC-to: stable/11
Sponsored by: HardenedBSD
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>

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Merge sync of head

Merge from HEAD

MFH: r278202,r278205-r278590

Sponsored by: The FreeBSD Foundation

Merge ^/head r278351 through r278498.

Update copyrights.

Replace the only instance of sed(1) in bsdconfig(8) with awk(1).

MFC after: 3 days

Revert SVN r278464 -- fingers were in perforce mode (premature
commit of future stuffs not yet ready).

Replace the only instance of sed(1) in bsdconfig(8) with awk(1).

MFC after: 3 days

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r263906.

Remove useless NULL string '' in compound strings. Look very closely.

Merge head up to r262222 (last merge was incomplete).

MFC @ r259205 in preparation for some SVM updates. (for real this time)

Performance and debugging enhancements:
+ Remove UNAME_P=$(...) from startup/misc -- already supplied by common.subr
+ Use f_getvar instead of $(eval echo \$$var) -- f_getvar is sub-shell free
+ Add

Performance and debugging enhancements:
+ Remove UNAME_P=$(...) from startup/misc -- already supplied by common.subr
+ Use f_getvar instead of $(eval echo \$$var) -- f_getvar is sub-shell free
+ Add `-e' and `-k var' options to f_eval_catch -- increasing use-cases
+ Use f_eval_catch to display errors on failure -- reducing duplicated code
+ Use f_eval_catch when we need output from a command -- improving debugging
+ Optimize f_isinter of strings.subr for performance -- now sub-shell free
+ Improve error checking on pidfiles -- using f_eval_catch and f_isinteger
+ Use $var_to_set arg of f_ifconfig_{inet,netmask} -- eliminate sub-shells
+ Use f_sprintf instead of $(printf ...) -- consolidate sub-shells
+ Use $var_to_set arg of f_route_get_default -- eliminate sub-shells
+ Add f_count to replace $(set -- ...;echo $#) -- eliminate sub-shells
+ Add f_count_ifs to replace $(IFS=x;set -- ...;echo $#) -- no sub-shells
+ Replace var="$var${var:+ }..." in loops with var="$var ..." with a follow-
up var="${var# }" to trim leading whitespace -- optimize loops
+ Use $var_to_set arg of f_resolv_conf_nameservers -- eliminate sub-shells
+ Comments for the f_eval_catch function
+ Remove a duplicate `local ... desc ...' in f_device_get_all of device.subr
+ Use $var_to_set arg of f_device_capacity -- eliminate sub-shells
+ Whitespace fixes in f_dialog_init of dialog.subr
+ Optimize f_inet_atoi of media/tcpip.subr for performance -- sub-shell free
+ In several cases, send stderr to /dev/null -- clean up runtime execution
+ Change f_err of common.subr to go to program stderr not terminal stderr,
allowing redirection of output from functions that use f_err
+ Disable debugging when using f_getvar to get variable argument to
f_startup_rcconf_map_expand of startup/rcconf.subr
+ Use f_replace_all instead of $(echo ... | tr | sed) -- performance
+ Add a $var_to_set option to f_index_{file,menusel_{command,keyword}} of
common.subr -- centralize sub-shells

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Merge head r233826 through r256722.

MFC - tracking commit

Add keymap.subr for presenting custom keymap dialogs (with X11 support).

Approved by: re (glebius)