openct: Fix rootfs creation errors

To fix error as following:
    file /var/run from install of openct-0.6.20-r0
    conflicts with file from package base-files-3.0.14

Signed-off-by: Dai Caiyun <daicy.fnst@cn.fujitsu.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit 387824f1763c573fd05c97c4b94122350717340c)
Signed-off-by: Armin Kuster <akuster808@gmail.com>