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

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

Approved by: re (implicit)

Fix WPA setup broken by changes to shell argument passing inside the
installer network configuration.

PR: bin/159558
Approved by: re (kib)

Fix two problems:
1) if no default gateway is given the route command will fail
and the script will abort with an error leading to an endless
loop unless configuration is cancelled or changed. [1]
2) In the IPv6 case add -inet6 to not alter the legacy IP default
route.

Reported by: Oleg Ginzburg (olevole olevole.ru) [1]
Tested by: Oleg Ginzburg (olevole olevole.ru) [1]
Approved by: re (kib)

To inet or not two inet. Unbreak static IPv4 configuration. If you tried
you were stuck in an endless loop.

Reported by: kensmith
Approved by: re (kib) for BETA1
Pointy hat to: bz - wonder why I had not tested legacy IP thoroughly..

Write the multi step netconfig to a temporary file and only move that
to the final name if netconfig was completely finished. This fixes
reentrance problems even better than r222611.

Suggested by: nwhitehorn
Reviewed by: nwhitehorn
Sponsored by: The FreeBSD Foundation
Sponsored by: iXsystems

Split netconfig into three parts:
- netconfig - what auto will call which in turn will check for
IPv4 and IPv6 to be available and ask the user to configure it
by calling
- netconfig_ipv4 doing DHCP and static IPv4 addresses, and
- netconfig_ipv6 doing rtsol and static IPv6 addresses,
and then checking, querying and updating resolv.conf upon return.
Both DHCP and rtsol (in the future) might update resolv.conf already so
we seed ourselves from that file if available.

Reviewed by: nwhitehorn
Sponsored by: The FreeBSD Foundation
Sponsored by: iXsystems