Update kernel source and configs to v3.17-rc2.

This time with an overlayfs module, yay!

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
overrides: Remove obsolete chromium test override.

No longer needed, as I have a Hydra with a jobset doing exactly that
now.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
zsh: Deactivate annoying newuser install in zshrc.

At the point where zshenv is sourced, the zsh-newuser-install function
is not yet available and is loaded afterwards. As the function is only
running in interactive shells anyway, let's as well put it into
interactiveShellInit.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>