read_only_rootfs_systemd: run update-tmpfiles, fix --sysroot path

Signed-off-by: Christopher Larson <kergoth@gmail.com>
dbus: prototype handling of /var/lib/dbus for r/o and non-r/o

Signed-off-by: Christopher Larson <kergoth@gmail.com>
Rename README to README.md

Signed-off-by: Christopher Larson <kergoth@gmail.com>
README.md: update the content review

Signed-off-by: Christopher Larson <kergoth@gmail.com>