Drop duplicated code pulled into armh feature in haste
and another half-copy that made it into build-ve feature;
make ve.mk more explicit about what it actually does
regarding default nameservers (and switch it to level3
while at that, just for diversity they preach).

It was a temporary hack actually, and is better dropped long-term:
things like predefined root accounts with remote access are *evil*
and this hook was a half of that "solution".

Use of oem feature to integrate first-boot setup is recommended
to deal with this issue, at least when graphics are available.

It basically reads the same but was referring to a neighbour
script that has been moved to a separate deflogin feature
during heavy refactoring of initial implementation draft.

As 50-sudo-su script cares for sudo and su control facilities no more
that hook is aptly renamed to 50-sshd-root (should be generalized
either some day).

Some of those were long asking to be done but cubox project
managed to actually get them done at least to the extent
needed for it; so let's land those and prune things up a bit.

The '[alt]' signature reference in the stock package
doesn't fit current reality as the hash files for
Sisyphus/armh are *not* cryptographically signed.

This commit should be reverted when these are.

It was actually done much earlier during an experiment with
Marvell ArmadaXP but is now integrated more or less properly.

NB: ext2 is not needed anymore (uboot should do it),
ext4 should become configurable by an existing knob.

These handle only VE-like products (think TWRP on Nexus 7);
the proper image support should be backported later on.

An experiment in layered configurations is still in its
early stages regarding ARM zoo...