The service unnecessarily populates /etc/qemu with a symlink, so it's not
possible to write files like /etc/qemu/bridge.conf or /etc/qemu/host.conf
anymore. Since etc-service-type uses file-union, it's possible to put files in
subdirectories. This restores the behavior suggested by manual where user can
extend etc-service-type with qemu/host.conf etc.
* gnu/services/virtualization.scm (/etc/qemu/firmware): Extend with
qemu/firmware instead of qemu
Change-Id: I7c1ea790e5abf7ad05dce56b7901ac6eb90208fd
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>