Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC revisions 230804,254265,255908,256338,256345,256347-256348,256489,
257842-257845,257872,259115,259143,259276,259468-259469,259572,259686,
260260-260262,260866, and 260900 (25 revisions; summarized below)...
r230804: Fix a whitespace nit (kevlo)
r254265: (recording mergeinfo only)
r255908: Remove the is (Iceland) mirror per mail from the admins (brd)
r256338: Dump 4096 bytes from /dev/random to /entropy (des)
r256345: Rewrite the keymap module
r256347: Detect when an interface is wireless (Warren Block)
r256348: Merge dumpdev into regular services; enable (Allan Jude)
r256489: Add executable bit to docsinstall and entropy scripts
r257842: Performance and debugging enhancements
r257843: Remove ttys(5) munging from previous commit
r257844: Copy install log to deployed /var/log for debugging
r257845: Fixup to last commit
r257872: Doc fixup -- add missing .El (joel)
r259115: Prevent log file from becoming truncated
r259143: Use sed(1) /i instead of /I (eadler)
r259276: Fix `local: Not in a function' error in logfile
r259468: Ignore mouse-release command from VMware
r259469: Mask error from newaliases(1) when hostname not fully qualified
r259572: Fix `rm: /tmp/bsdinstall_etc/fstab: ..." error in logfile
r259686: Move VMware mouse-release solution
r260260: Remove what appears to be a stray debugging printf
r260261: Lower priority of open wireless access policy (gavin)
r260262: Allow bsdinstall to use WPA-Enterprise networks (gavin)
r260866: Fix bad comparison and fix file comment (Christoph Mallon)
r260900: Whitespace and style nits

MFC r245742:

Fix typo and simplify condition.

Submitted by: Christoph Mallon <christoph dot mallon at gmx dot de>
Missed MFC pointed out by: Garrett Cooper

MFC r245700,245701,245702,245706,245707,245758,245759,245760,245792,245796,
245980,246013:

Automated installation support for bsdinstall.

MFC r230482-230484,r230997:

Per popular demand, if installing from a graphics terminal, show the
installer log in real time on VTY 3, and spawn a shell on VTY 4.

PR: bin/161048

MFC: r231123

- Set TERM to cons25w on pc98 because we still use old cons25w terminal
to show Japanese.
- Add cons25w to terminal lists.

Reviewed by: nwhitehorn

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Inquire about terminal type if starting from a serial console and do
not configure the host's networking if netbooted [1]. Also fix FTP
installations behind some firewalls [2].

PR: bin/159583 [2]
Reported by: stas [1]
Approved by: re (kib)

Allow the user to use the live environment post-installation, as well
as improving error handling.

Add additional release makefile for bsdinstall-based media, along with
support files. This does not change the default behavior of anything.

To make bsdinstall-based media, pre-build world and GENERIC, then run
the release target in Makefile.bsdinstall.