The 'lang' option will be added by gfxboot according with
choosed language.

Turns out that vm images might need localization too,
not just live ones.

These are aimed to test the modules.d/ and auto-pickup
implementation as well as to present an example.

At least 50-net might change (or just get renamed to avoid
auto-pickup) some day as the "net" feature's meaning is
to provide networking upon bootup and these modules are
only needed within stage1 if we're going to netboot;
and that's quite different thing.

armh-cubox bits are prone to get renamed/generalized too
since e.g. ArmadaXP based server images are going to need
this as well.

Aimed at live images at first but should cover installers as well.

This has been brewing for quite some time and while the proper
implementation is considerably more complex (and hard to do)
looks like there's demand for the particular important use case,
namely LiveCDs for Russian users, so this code has been shared
with a few people before merge.