contents-runtime: Move util-linux packages together

This is more a style improvement rather than a functional change.
contents-devel: Add util-linux-dev instead of util-linux-libuuid-dev
contents-runtime: Add missing util-linux packages
contents-runtime: Add gnupg
contents: Fix getopt

Remove getopt symlink first; util-linux creates /usr/bin/getopt
and /bin/getopt the latter being a symlink to the former, if we
mv /bin contents over /usr/bin we'll end up with a /usr/bin/getopt
symlink pointing to itself.
Drop ruby bbappend

This fixes ruby cross install although it pulls in tcl.
mauidistro: Enable systemd distro feature

This will create systemd units for services supporting it.