A few remaining tidbits lingering in RELENG-e2k-workstation.

This commit is actually a rework of what's been done
in RELENG-e2k-workstation private branch (along with
a few more generic fixups).

This started as a three-seater 801-PC support for
ALT Education 9.0 for Elbrus.

Some packages are still not available on some arches yet;
this time it's a e2k starterkits related fixup.

Fixes: e2cb6a09

A typo was made while reworking the patches. Forgive me cas@

This parts reverts commit cff3291c.
Upstream mkimage has not yet take patches to support packaging
multiple kernels to ISO image. In order to avoid problems, have
to revert this commit.

See-also: 01a1581b

For group policy control.

No use for WS, just use browser for video conferences.
This reverts commit da17ec5553867bd10c0e4d3bef4101dd0ca29005.

As suggested in ALT bug #38523.
This reverts commit 05c47eb6deedbe7de3f2882ddabf7d5887720aa6.

See ALT bug #37766.

See ALT bugs #37967, #37966.