failing vagrant builds due to not supported keyboard configuration

Created by: shibumi

Currently we get the following error while trying to build:

==> virtualbox-iso: Provisioning with shell script: provision/postinstall.sh
    virtualbox-iso: + hostnamectl set-hostname archlinux
    virtualbox-iso: + localectl set-keymap us
    virtualbox-iso: + localectl set-x11-keymap us
    virtualbox-iso: Failed to set keymap: Local keyboard configuration not supported on this system.

This affects every provider.

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