Don't put special characters in SLOF
Don't put special characters in SLOF

When SLOF is used by OBS, putting control characters breaks log. It
becomes binary file instead of just plain text

Signed-off-by: Dinar Valeev <5117617bf147dfe0d669bc60877f607cdec8696e@suse.com>

k0da/SLOF,k0da/SLOF,k0da/SLOF,k0da/SLOF