Switch default console tty from /dev/console to /dev/constty

With this switch processes (such as xconsole) can open /dev/console
without breaking login on the text or serial console. This can be
trivially triggered by enabling xdm in rc.conf and hitting
Ctrl+Alt+F1 or equivalent once booted.

The changes:
- Add entry for /dev/console or /dev/constty if missing
- If a port's had /dev/console 'on' switch it off and enable /dev/constty
- If a port did not have /dev/console 'on', leave /dev/constty off

Some ports had /dev/console off and /dev/ttyE0 enabled, presumably to
avoid just this issue. It may make sense to adjust these also (but not
in this pass)

As discussed on current-users

Per discussion on tech-userlevel, finally fix PR 10127:
move all ttyE* entries that use "vt100" emulation to wsvt25 term type.
The terminfo vt220 entry lacked (correctly) a delete key entry, which
was a regression against the netbsd-5 termcap entry. On the other hand,
only a very small number of foreign systems lacks support for wsvt25
nowadays.

branches: 1.11.18; 1.11.20;
Add a constty entry, marked 'off', with otherwise the same settings
as the console. Now when coming up in single user mode the tset in
/.profile can set the terminal type correctly.
Note: I believe constty should be 'on' and console 'off', but thats a
separate discussion

branches: 1.10.26;
remove ad-hok list of pty's from port tty files, and auto-generate it so
that it is consistent, and in the proper order.

Revert 'console' back to /dev/console (from /dev/constty)

Change 'console' login to use /dev/constty so that its output isn't
stolen by code that requests system messages using TIOCCONS.

Added ttyp[g-zA-Z] (bin/15594).

This should be the final part of moving to 64 PTYs by default. Added
entries for tty{r,s}{0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f} to /etc/ttys.

Thanks to Matthew Green for pointing out the need.

branches: 1.5.8;
Set console and ttyE? term types to vt100.

branches: 1.4.8;
add a ttyE1 line

Use "std.9600" instead of "Pc" for the line type.
rename SCC tty devices from tty0? to ttyB?. add entries for ttyC?
(AlphaStation ns16550 "com" ports), and ttyE? (Workstation console
(framebuffer & keyboard) emulators).

start a getty on console, even though it's not clear that that's correct.

alpha etc files

Per discussion on tech-userlevel, finally fix PR 10127:
move all ttyE* entries that use "vt100" emulation to wsvt25 term type.
The terminfo vt220 entry lacked (correctly) a delete key entry, which
was a regression against the netbsd-5 termcap entry. On the other hand,
only a very small number of foreign systems lacks support for wsvt25
nowadays.

branches: 1.11.18; 1.11.20;
Add a constty entry, marked 'off', with otherwise the same settings
as the console. Now when coming up in single user mode the tset in
/.profile can set the terminal type correctly.
Note: I believe constty should be 'on' and console 'off', but thats a
separate discussion

branches: 1.10.26;
remove ad-hok list of pty's from port tty files, and auto-generate it so
that it is consistent, and in the proper order.

Revert 'console' back to /dev/console (from /dev/constty)

Change 'console' login to use /dev/constty so that its output isn't
stolen by code that requests system messages using TIOCCONS.

Added ttyp[g-zA-Z] (bin/15594).

This should be the final part of moving to 64 PTYs by default. Added
entries for tty{r,s}{0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f} to /etc/ttys.

Thanks to Matthew Green for pointing out the need.

branches: 1.5.8;
Set console and ttyE? term types to vt100.

branches: 1.4.8;
add a ttyE1 line

Use "std.9600" instead of "Pc" for the line type.
rename SCC tty devices from tty0? to ttyB?. add entries for ttyC?
(AlphaStation ns16550 "com" ports), and ttyE? (Workstation console
(framebuffer & keyboard) emulators).

start a getty on console, even though it's not clear that that's correct.

alpha etc files

pullup 1.4->1.5 (ross)

This should be the last piece of the move to 64 default PTYs. /etc/ttys now
has entries for 64 ptys.

Thanks to Matthew Green for pointing out the need for this.

Sync with HEAD.

Pull up following revision(s) (requested by martin in ticket #342):
etc/etc.shark/ttys: revision 1.8
etc/etc.hpcsh/ttys: revision 1.11
etc/etc.amiga/ttys: revision 1.24
etc/etc.arc/ttys: revision 1.8
etc/etc.alpha/ttys: revision 1.12
etc/etc.amigappc/ttys: revision 1.3
etc/etc.ofppc/ttys: revision 1.9
etc/etc.hp300/ttys: revision 1.16
etc/etc.rs6000/ttys: revision 1.2
etc/etc.i386/ttys: revision 1.20
etc/etc.acorn26/ttys: revision 1.4
etc/etc.iyonix/ttys: revision 1.4
etc/etc.netwinder/ttys: revision 1.8
etc/etc.mac68k/ttys: revision 1.20
etc/etc.evbarm/ttys: revision 1.7
etc/etc.pmax/ttys: revision 1.15
etc/etc.hpcmips/ttys: revision 1.10
share/terminfo/terminfo: revision 1.5
etc/etc.mvmeppc/ttys: revision 1.6
etc/etc.next68k/ttys: revision 1.10
etc/etc.acorn32/ttys: revision 1.9
etc/etc.ibmnws/ttys: revision 1.4
etc/etc.atari/ttys: revision 1.10
etc/etc.sgimips/ttys: revision 1.10
etc/etc.newsmips/ttys: revision 1.9
etc/etc.hpcarm/ttys: revision 1.6
etc/etc.cats/ttys: revision 1.7
etc/etc.amd64/ttys: revision 1.6
etc/etc.prep/ttys: revision 1.8
etc/etc.zaurus/ttys: revision 1.3
Per discussion on tech-userlevel, finally fix PR 10127:
move all ttyE* entries that use "vt100" emulation to wsvt25 term type.
The terminfo vt220 entry lacked (correctly) a delete key entry, which
was a regression against the netbsd-5 termcap entry. On the other hand,
only a very small number of foreign systems lacks support for wsvt25
nowadays.
Add a delete key capability to our wsvt25 entry. Fixes a problem noted by
David Lord on netbsd-users.

sync with head