Reintroduce the support of MKCATPAGES

Requested by <mrg>

Remove the catman sets support

Remnant of MKCATPAGES

Remove the isdn sets from syspkg, now that they have no user left.

Remove dhclient from the base system.

Discussed here:
https://mail-index.netbsd.org/tech-userlevel/2018/06/21/msg011233.html

branches: 1.6.46; 1.6.48;
Remove tn3270 from sets

branches: 1.5.20;
Remove some more krb4 remnants.

remove sushi

Add missing NetBSD ID tags

Separate various parts of sushi(8) from the *-sysutil-* packages into new
*-sushi-* packages.

Suggested by Allen Barret in PR misc/16900:

>$ grep base-sysutil distrib/sets/lists/base/mi | grep sushi | wc -l
> 288
>$ grep base-sysutil distrib/sets/lists/base/mi | grep -v sushi | wc -l
> 136
>
>In a future where syspkgs are useful, it seems likely that some
>people will want to avoid installing sushi, while others will want to
>be able to upgrade sushi without upgrading the entire system. Several
>small subsystems, including cron and lpr, have their own syspkg sets,
>and it seems reasonable to do the same for the sushi subsystem.

branches: 1.1.1;
Initial revision

Remove the isdn sets from syspkg, now that they have no user left.

Remove dhclient from the base system.

Discussed here:
https://mail-index.netbsd.org/tech-userlevel/2018/06/21/msg011233.html

branches: 1.6.46;
Remove tn3270 from sets

branches: 1.5.20;
Remove some more krb4 remnants.

remove sushi

Add missing NetBSD ID tags

Separate various parts of sushi(8) from the *-sysutil-* packages into new
*-sushi-* packages.

Suggested by Allen Barret in PR misc/16900:

>$ grep base-sysutil distrib/sets/lists/base/mi | grep sushi | wc -l
> 288
>$ grep base-sysutil distrib/sets/lists/base/mi | grep -v sushi | wc -l
> 136
>
>In a future where syspkgs are useful, it seems likely that some
>people will want to avoid installing sushi, while others will want to
>be able to upgrade sushi without upgrading the entire system. Several
>small subsystems, including cron and lpr, have their own syspkg sets,
>and it seems reasonable to do the same for the sushi subsystem.

branches: 1.1.1;
Initial revision

Remove tn3270 from sets

branches: 1.5.20;
Remove some more krb4 remnants.

remove sushi

Add missing NetBSD ID tags

Separate various parts of sushi(8) from the *-sysutil-* packages into new
*-sushi-* packages.

Suggested by Allen Barret in PR misc/16900:

>$ grep base-sysutil distrib/sets/lists/base/mi | grep sushi | wc -l
> 288
>$ grep base-sysutil distrib/sets/lists/base/mi | grep -v sushi | wc -l
> 136
>
>In a future where syspkgs are useful, it seems likely that some
>people will want to avoid installing sushi, while others will want to
>be able to upgrade sushi without upgrading the entire system. Several
>small subsystems, including cron and lpr, have their own syspkg sets,
>and it seems reasonable to do the same for the sushi subsystem.

branches: 1.1.1;
Initial revision

Import NetBSD System Package (syspkg) sypport for the base, comp, etc, games,
man, misc, and text sets (i.e. all non-X11 sets).

This support currently allows two make(1) targets to be executed from
src/distrib/syspkg/sets:

a.) `make register' will register the existing system as packages.
This willl allow the version of software on the current system
to be queried with

PKG_DBDIR=/var/db/syspkg pkg_info

and individual packages to be deleted with

PKG_DBDIR=/var/db/syspkg pkg_delete <pkgname>

b.) `make package' will create binary packages from the existing
system (or from the contents of ${DESTDIR}, if ${DESTDIR} is
set). These packages can be taken to another system, and
installed with

PKG_DBDIR=/var/db/syspkg pkg_add <pkgname>

to update or install specific packages.

The need to explicitly specify the syspkg PKG_DBDIR will be replaced with a
flag for the various pkg tools in the next few days.

Sync with HEAD.