DIR names changed to

Hi,

thank you for you quickstart. Really helped me for starting with python3.
Just based on comment 
https://openshift.redhat.com/community/blogs/lightweight-http-serving-using-nginx-on-openshift#comment-24957
there should be now changed the variable name
$OPENSHIFT_RUNTIME_DIR to $OPENSHIFT_DATA_DIR

So noting when you would like do that change.

Cheers
Ondra