Fix debug output that has erroneously been committed with the last update.

Obtained from: Jan Beich

MFC r270647: Add references to vt(4) and the configuration files in /usr/sha
MFC r270653: Update man-pages to correctly refer to changed pathes and namin
MFC r270657: More man pages that need to know about vt in addition to syscon
MFC r270659: (by pluknet@) Missed comma.
MFC r270660: Back-out the references to vt(4) from this man-page. It appears
MFC r270933: Add references to vt(4) to further man-pages.
MFC r270934: Final patches to the tools used to convert syscons keymaps for
MFC r270935: Add vt(4) support to the console initialisation script, specifi

Second batch of MFCs to add support for Unicode keymaps for use with vt(4).

It contains the following changes:

- Add references to vt(4) to relevant man-pages.
- Update comment in defaults/rc.conf to mention vt
- Update rc.d/syscons to warn about syscons keymaps used under vt.
An attempt is made to identify the vt keymap to load instead.
- Minor changes to the conversion tool based on mail comments on keymaps.

Relnotes: yes

MFC 270131, 270152, 270199, 270232:

Add converter from SYSCONS keymap format to NEWCONS and
configuration files. The convert-keymap.pl script can
be used to convert private SYSCONS keymaps ro NEWCONS
format.

Import the tools used to convert the keymap files from SYSCONS (in locale
dependent encoding) to NEWCONS (Unicode).

The file "LANG.map" is used to convert INDEX.keymaps. It has 3 columns:
- the language ID as used in the source file
- the language ID to be used in the generated file (e.g. "iw" -> "he")
- the encoding of the menu texts for this language
The conversion result is written to STDOUT.

The file "KBDFILES.map" is used to batch convert keymap files. It's
columns are:
- the encoding used for the keymap sounce file
- the name of the source file
- the name of the generated file
The output files are created in the TEMP sub-directory of the vt keymap
directory, in order to preserve (possibly uncommitted) keymap files in
/usr/src/share/vt/keymaps.

The convert-keymap.pl script can be directly executed by passing the
source file name and the encoding on the command line. It writes to
STDOUT and generates hex Unicode codepoints by default. (This can be
changed to decimal in the script.)

While written for the one-time conversion of the SYSCONS keymaps into
the format required for NEWCONS, I think these tools may be useful for
easy conversion of possible further SYSCONS keymap files, that have not
been committed to the source tree.